Answer:
Step-by-step explanation:
Objective: Solve distance problems by creating and solving a linear
equation.
An application of linear equations can be found in distance problems. When
solving distance problems we will use the relationship rt = d or rate (speed) times
time equals distance. For example, if a person were to travel 30 mph for 4 hours.
To find the total distance we would multiply rate times time or (30)(4) = 120.
This person travel a distance of 120 miles. The problems we will be solving here
will be a few more steps than described above. So to keep the information in the
problem organized we will use a table. An example of the basic structure of the
table is blow:
Rate Time Distance
Person 1
Person 2
Table 1. Structure of Distance Problem
The third column, distance, will always be filled in by multiplying the rate and
time columns together. If we are given a total distance of both persons or trips we
will put this information below the distance column. We will now use this table to
set up and solve the following example
1
Example 1.
Two joggers start from opposite ends of an 8 mile course running towards each
other. One jogger is running at a rate of 4 mph, and the other is running at a
rate of 6 mph. After how long will the joggers meet?
Rate Time Distance
Jogger 1
Jogger 2
The basic table for the joggers, one and two
Rate Time Distance
Jogger 1 4
Jogger 2 6
We are given the rates for each jogger.
These are added to the table
Rate Time Distance
Jogger 1 4 t
Jogger 2 6 t
We only know they both start and end at the
same time. We use the variable tfor both times
Rate Time Distance
Jogger 1 4 t 4t
Jogger 2 6 t 6t
The distance column is filled in by multiplying
rate by time
8 We have total distance, 8 miles, under distance
4t + 6t = 8 The distance column gives equation by adding
10t = 8 Combine like terms, 4t + 6t
10 10 Divide both sides by 10
t =
4
5
Our solution fort, 4
5
hour(48 minutes)
As the example illustrates, once the table is filled in, the equation to solve is very
easy to find. This same process can be seen in the following example
Example 2.
Bob and Fred start from the same point and walk in opposite directions. Bob
walks 2 miles per hour faster than Fred. After 3 hours they are 30 miles apart.
How fast did each walk?
Rate Time Distance
Bob 3
Fred 3
The basic table with given times filled in
Both traveled 3 hours
2
Rate Time Distance
Bob r + 2 3
Fred r 3
Bob walks 2 mph faster than Fred
We know nothing about Fred,so use r for his rate
Bob is r + 2,showing 2 mph faster
Rate Time Distance
Bob r + 2 3 3r + 6
Fred r 3 3r
Distance column is filled in by multiplying rate by
Time.Be sure to distribute the 3(r +2)for Bob.
30 Total distance is put under distance
3r + 6+ 3r = 30 The distance columns is our equation, by adding
6r +6 = 30 Combine like terms 3r + 3r
− 6 − 6 Subtract 6 from both sides
6r = 24 The variable is multiplied by 6
6 6 Divide both sides by 6
r =4 Our solution for r
Rate
Bob 4+2 =6
Fred 4
To answer the question completely we plug 4 in for
r in the table.Bob traveled 6 miles per hour and
Fred traveled 4 mph
Some problems will require us to do a bit of work before we can just fill in the
cells. One example of this is if we are given a total time, rather than the individual times like we had in the previous example. If we are given total time we
will write this above the time column, use t for the first person’s time, and make
a subtraction problem, Total − t, for the second person’s time. This is shown in
the next example
Example 3.
Two campers left their campsite by canoe and paddled downstream at an average
speed of 12 mph. They turned around and paddled back upstream at an average
rate of 4 mph. The total trip took 1 hour. After how much time did the campers
turn around downstream?
Rate Time Distance
Down 12
Up 4
Basic table for down and upstream
Given rates are filled in
1 Total time is put above time column
Rate Time Distance
Down 12 t
Up 4 1 − t
As we have the total time, in the first time we have
t,the second time becomes the subtraction,
total − t
3
Rate Time Distance
Down 12 t 12t
Up 4 1 − t 4 − 4t
=
Distance column is found by multiplying rate
by time.Be sure to distribute 4(1 − t)for
upstream. As they cover the same distance,
= is put after the down distance
12t = 4 − 4t With equal sign, distance colum is equation
+ 4t + 4t Add4tto both sides so variableis onlyon one side
16t =4 Variable is multiplied by 16
16 16 Divide both sides by 16
t =
1
4
Our solution,turn around after 1
4
hr(15 min )
Another type of a distance problem where we do some work is when one person
catches up with another. Here a slower person has a head start and the faster
person is trying to catch up with him or her and we want to know how long it
will take the fast person to do this. Our startegy for this problem will be to use t
for the faster person’s time, and add amount of time the head start was to get the
slower person’s time. This is shown in the next example.
In the diagram, segment AD bisects angle BAC.
Given the following segment lengths, find the value of x.
Round to the nearest tenth.
AB: 19
AC: 17
Show all your work
The length of side x is 10 units
How to determine the length of side xFrom the question, we have the following parameters that can be used in our computation:
Segment AD bisects angle BAC.
Using the above as a guide, we have the following:
BD = DC
substitute the known values in the above equation, so, we have the following representation
x = 20 - x
Evaluate the like terms
2x = 20
Divide by 2
x = 10
Hence, the value of x is 10
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You are making a round flower garden in your yard. The circumference of the garden will be 60 inches. What is the diameter? Use 3.14 to approximate pi. Round to the nearest tenth.
The diameter of the circular garden round to the nearest tenth will be 19.1 inches.
What is the diameter of a circle?In a circle, an infinite number of diameters can be drawn. A diameter is a straight line passing through the center and joins two points of the circumference of a circle. The length of a diameter is twice the length of the radius.
The circumference of a circle is given by C = πd, where d is the diameter of the circle and π can be taken as 3.14.
Substitute C = 60 and π = 3.14 into the above formula and find d.
60 = 3.14×d
d = 60/3.14
≈ 19.108
≈ 19.1
Therefore, the obtained answer is 19.1 inches.
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a rectangular lot is 165 feet long and 90 feet wide how many feet of fencing are needed to make a diagonal fence for the lot? round to the nearest foot
Answer:
Step-by-step explanation:
To find the diagonal of a rectangular lot, you can use the Pythagorean theorem. The theorem states that in a right triangle, the square of the length of the hypotenuse (the longest side, also known as the diagonal of the rectangle) is equal to the sum of the squares of the lengths of the other two sides.
So, for a rectangular lot 165 feet long and 90 feet wide, the length of the diagonal can be calculated as follows:
d = √(165^2 + 90^2) = √(27225 + 8100) = √35325 = 189 feet
The diagonal fence for the lot would require 189 feet of fencing. To round this to the nearest foot, we would round up to 190 feet, since 189.5 is closer to 190 than 189.
Therefore, 190 feet of fencing are needed to make a diagonal fence for the lot.
how to calculate standard deviation using ti-84
The steps to calculate standard deviation using a TI-84 calculator:
1.Enter the data into a list
2.Calculate the mean
3.Calculate the standard deviation
Here are the steps to calculate standard deviation using a TI-84 calculator:
1.Enter the data into a list: Press STAT, then ENTER, and then use the arrow keys to move to a list (e.g., L1, L2, etc.) and press ENTER. Enter the data into the list by typing each value followed by ENTER.
2.Calculate the mean: Press STAT, then RIGHT ARROW to select the CALC menu, and then select 1: 1-Var Stats. This will display a list of variables. Type the list name that contains the data and press ENTER. The calculator will display the mean value.
3.Calculate the standard deviation: From the same list in step 2, look for "Sx" or "σx" in the output. Sx stands for the sample standard deviation, and σx stands for the population standard deviation.
That's it! Now you know how to calculate standard deviation using a TI-84 calculator.
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Camden went to the grocery store and purchased cans of soup and frozen
dinners. Each can of soup has 150 mg of sodium and each frozen dinner has
300 mg of sodium. Camden purchased a total of 7 cans of soup and frozen
dinners which collectively contain 1500 mg of sodium. Graphically solve a
system of equations in order to determine the number of cans of soup
purchased, x, and the number of frozen dinners purchased, y.
Answer:
First off that is my name.
y=-0.5x+5 is the first equation. I don't know the second.
Sorry
Step-by-step explanation:
solve the system of equations y=4x-3 and y=-2x+9 what is x and y will give brainliest
To solve the system of equations y=4x-3 and y=-2x+9, we can set the two equations equal to each other and solve for x:
4x - 3 = -2x + 9
Adding 2x and 3 to both sides, we get:
6x = 12
Dividing both sides by 6, we get:
x = 2
Now that we have the value of x, we can substitute it into either of the original equations to find the corresponding value of y. Let's use the first equation:
y = 4x - 3
y = 4(2) - 3
y = 8 - 3
y = 5
Therefore, the solution to the system of equations is x = 2 and y = 5. The solution is the ordered pair (2, 5).
(6e-3-4)x2. Please help me solve this
Answer:
-7.988 or -2E
Step-by-step explanation:
The function f(x) = 0.81x + 168.3 models the cholesterol level of an American woman as a function
of her age, x, in years. Use the function to find f(75).
A) 229.05
B) 107.55
C) 10,224.225
D) 244.11
Answer:
D) 229.05
Step-by-step explanation:
f(75) = 0.81(75) + 168.3 = 229.05
Zach scores a ringer 40% of the time
Dale's Pizza sells pizza by the slice for lunch. Today, there are 68 slices ready for lunch, including 20 slices of mushroom pizza.
What is the probability that a randomly selected slice will be a slice of mushroom pizza?
Write your answer as a fraction or whole number.
P(mushroom)
Answer:
It should be = 20/68 = 0.294117647
A college cafeteria is looking for a new dessert to offer its 4,000 students. The table shows the preference of 225 students.
Ice Cream Candy Cake Pie Cookies
9
72
36
27
81
Which statement is the best prediction about the number of cookies the college will need?
The college will have about 480 students who prefer cookies.
O The college will have about 640 students who prefer cookies.
O The college will have about 1,280 students who prefer cookies.
O The college will have about 1,440 students who prefer cookies.
Using inferential statistics, it is found that the option that is best surveyed from the collected in the survey is given by:
D. The Number of students who prefer cookies and cream is higher than the number of those who prefer chocolate and those who prefer strawberry.
What is an inferential statistic?An inferential statistic is one that makes inference or predictions about a population based on a sample.
From the table, we have that cookies and cream is the most popular flavor, hence the correct option is:
D. The Number of students who prefer cookies and cream is higher than the number of those who prefer chocolate and those who prefer strawberry.
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how many cubic feet to liters?
One cubic foot is equal to approximately 28.3168 liters. So to convert cubic feet to liters, you can multiply the number of cubic feet by 28.3168.
Unit conversion is the process of converting a value expressed in one unit of measurement to an equivalent value expressed in another unit of measurement. For instance, to convert 10 feet to meters, you would use the conversion factor 1 foot = 0.3048 meters.
For example, if you have a volume of 5 cubic feet, you can convert it to liters as follows:
5 cubic feet * 28.3168 liters/cubic foot = 141.584 liters
Therefore, 5 cubic feet is equivalent to 141.584 liters (approximately).
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What is time complexity cheat sheet ?
A time complexity cheat sheet is a reference guide that provides an overview of the time complexity of common algorithms and operations in computer science.
Time complexity is a measure of the amount of time an algorithm takes to solve a problem, expressed in terms of the input size of the problem. It is typically denoted using Big O notation, which provides an upper bound on the amount of time an algorithm takes.
A time complexity cheat sheet can be useful for quickly determining the time complexity of an algorithm or operation, as well as for comparing the time complexity of different algorithms. Some common time complexities that may be included in a time complexity cheat sheet are:
O(1): Constant time complexity. An algorithm with O(1) time complexity takes a fixed amount of time, regardless of the input size.
O(log n): Logarithmic time complexity. An algorithm with O(log n) time complexity takes time proportional to the logarithm of the input size.
O(n): Linear time complexity. An algorithm with O(n) time complexity takes time proportional to the input size.
O(n log n): Log-linear time complexity. An algorithm with O(n log n) time complexity takes time proportional to the input size multiplied by the logarithm of the input size.
O(n^2): Quadratic time complexity. An algorithm with O(n^2) time complexity takes time proportional to the square of the input size.
O(2^n): Exponential time complexity. An algorithm with O(2^n) time complexity takes time proportional to two raised to the power of the input size.
Other time complexities may also be included, depending on the complexity of the algorithm or operation. A time complexity cheat sheet can be a helpful tool for understanding and analyzing algorithms, but it is important to remember that time complexity is not the only factor to consider when evaluating the performance of an algorithm.
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What is SSS in geometry
SSS" is when we know three sides of the triangle, and want to find the missing angles
Ayaan deposited $746 into a tax-free savings account. He earns 2.15% interest. How much money will he have in his account after 6 months?
The amount that Ayaan will have in his tax-free savings account after 6 months of depositing $746 at 2.15% interest is $754.02.
What is the future value?The future value refers to the present value plus the interest.
The future value for this savings account can be computed using the simple interest system since there is no compounding of interest.
The initial deposit (present value) = $746
Interest rate = 2.15%
Savings period = 6 months
Future value = $754.02 ($746 + ($746 x 2.15% x 6/12)
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A company sells orange juice in spherical containers that look like oranges. Each container has a surface area of approximately 50.3 sq.in. What is the volume of the container?
We can determine the radius of the container using the formula for a sphere's surface area because it resembles an orange and has a surface area of roughly 50.3 square inches:
A sphere's surface area equals [tex]4 r^2[/tex].
where r denotes the sphere's radius.
50.3 sq. = 4πr²
By multiplying both sides by 4, we obtain:
r² = 50.3 sq. / (4π)
r² ≈ 4
When we square the two sides, we obtain:
r ≈ 2
Hence, the spherical container has a radius of around 2 inches.
The volume of the container can now be calculated using the following formula:
A sphere's volume equals [tex](4/3)r^3[/tex].
Container volume = (4/3) X(23)
The container's volume is 33.5 cubic inches.
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A
65%
B
Reflex Angle B =
degrees.
The measure of angle B is given as follows:
<B = 295º.
How to obtain the measure of angle B?Angles A and B in the context of this problem are reflex angles, meaning that the sum of their measures is of 360º.
The measures are given as follows:
<A = 65º.<B is unknown.Hence the measure of angle B is obtained as follows:
65 + <B = 360
<B = 360 - 65
<B = 295º.
Missing InformationThe diagram modeling the situation is given by the image presented at the end of the answer.
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please help me!!:)
MULTIPLE CHOICE QUESTION
A car was purchased in 2010 for $20,000.
The car is depreciating by 15% each year.
What is the "a" value?
Answer:
20,000
Step-by-step explanation:
I'm assuming your class is using this model of the exponential decay function:
f(x) = a(1 - r)^x
In this case, the equation would be:
f(x) = 20,000(1 - .15)^x
or, when 1 - r is calculated:
f(x) = 20,000(.85)^x
The "a" value is basically the starting value, because on a graph, the starting value would be where x = 0. Anything to the 0th power is 1, and anything multiplied by 1 is the same thing, making "a" the same as the starting value, or the y-intercept.
Therefore, a = 20,000.
Hope this helps!
If 0° ≤ Θ≤ 360°, then find angle(s) Θ.
1) sec Θ = undefined
Answer:
The secant function is undefined for angles where the cosine function equals zero, because dividing by zero is undefined. Therefore, we need to find the values of Θ where cos Θ = 0.
The cosine function equals zero at 90° and 270° (or π/2 and 3π/2 in radians), so we have:
cos 90° = 0, cos 270° = 0
Therefore, the angles that satisfy sec Θ = undefined are:
Θ = 90° + 360°k, Θ = 270° + 360°k
where k is an integer (positive, negative, or zero) that allows us to generate all possible angles in the range 0° ≤ Θ ≤ 360°.
So, the solutions for Θ are:
Θ = 90° + 360°k, Θ = 270° + 360°k
where k is an integer.
Step-by-step explanation:
the shorter leg of a 30-60-90 triangle is 3.4 inches long find the perimeter
Answer: 23.56 in
Step-by-step explanation:
The perimeter of the 30-60-90 triangle with a shorter leg of 3.4 inches is 16.08 inches.
What is Triangle?A triangle is a three-sided polygon that consists of three edges and three vertices.
In a 30-60-90 triangle, the lengths of the sides are in the ratio of 1:√3:2, where the shortest side is opposite the 30-degree angle,
the medium side is opposite the 60-degree angle, and
the longest side is opposite the 90-degree angle.
So if the shorter leg of the triangle is 3.4 inches long, the other two sides can be found as follows:
Medium side =√3× shorter leg
= 1.732 × 3.4
= 5.88 inches
Longest side = (2 × shorter leg)
= (2 × 3.4)
= 6.8 inches
The perimeter of the triangle is simply the sum of the lengths of all three sides:
Perimeter = Shorter leg + Medium side + Longest side
= 3.4 + 5.88 + 6.8
= 16.08 inches
Therefore, the perimeter of the 30-60-90 triangle with a shorter leg of 3.4 inches is 16.08 inches.
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If point (x, y) is rotated 90 degrees about the origin, the resulting point is (-y, -x).
The statement "If point (x, y) is rotated 90 degrees about the origin, the resulting point is (-y, -x)." is incorrect.
The origin of the coordinate plane is the point (0, 0), and it is the center of rotation for many geometric transformations.
When a point (x, y) is rotated 90 degrees about the origin, the resulting point is (-y, x). This is because rotation by 90 degrees counterclockwise causes the x-coordinate to become the negative of the original y-coordinate and the y-coordinate to become the original x-coordinate.
To see this, imagine the point (x, y) on the coordinate plane and draw a line segment connecting the point to the origin. The length of this line segment is given by the Pythagorean theorem as the square root of x² + y². After rotating the point 90 degrees about the origin, the line segment will be perpendicular to the original line segment and have a length equal to y and -x.
In summary, rotating a point (x, y) at 90 degrees about the origin results in the point (-y, x) due to the change in the direction and length of the line segment connecting the point to the origin.
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what the metric system of measurement is based on the number?
The metric system of measurement is based on the number 10.
This system is also known as the International System of Units (SI) and is used in most countries around the world. In the metric system, various units of measurement are defined as multiples or fractions of a base unit, which is defined for each quantity being measured. For example, the base unit for length is the meter, and the base unit for mass is the kilogram. Prefixes such as kilo-, centi-, and milli- are used to indicate multiples or fractions of the base unit, based on factors of 10. For example, a kilometer is 1000 meters, a centimeter is 1/100 of a meter, and a milligram is 1/1000 of a gram. This makes the metric system easy to use and convert between units, as well as consistent and universally recognized.
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3. Xavier has $43 in his savings account and plans to save $15 each week. Write an algebraic expression to represent how much Xavier will have in his savings account after w weeks.
An algebraic expression representing the amount Xavier will have in his savings account after w weeks is 43 + 15w.
What is algebraic expression?Algebraic expressions consist of numbers, variables, and the mathematical operations, especially addition, subtraction, division, and multiplication.
An algebraic expression does not have the equation symbol (=) unlike an equation because it is not a complete mathematical statement.
The amount Xavier already has in his savings account = $43
The planned weekly savings = $15
The period of savings = w
Algebraic Expression:43 + 15w
Thus, using an algebraic expression, after w weeks, Xavier will have 43 + 15w in his savings account.
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Identify the x-intercept and y-intercept of the line 3x - 6y= - 12.
Answer: x intercept: -4, y intercept: 2 (look at the image for the solution)
Step-by-step explanation:
Answer:
x intercept: -4, y intercept: 2
Step-by-step explanation:
WHAT IF? The total cost of the vans for Location A is $228,500. The total cost for Location B is $153,000. What is the cost of
each type of van? Location A buys 7 large and 2 small vans, location B buys 2 large and 3 small vans
The cost of each large van is 22,323.53 and each small van is 36,117.65.
What are Linear Equations?Linear equations are equation involving one or more expressions including variables and constants and the variables are having no exponents or the exponent of the variable is 1.
Let x be the cost of a large van and y be the cost of a small van.
The total cost of the vans for Location A is $228,500.
Location A buys 7 large and 2 small vans.
So we have a linear equation,
7x + 2y = 228,500
The total cost for Location B is $153,000.
Location B buys 2 large and 3 small vans.
So we have a linear equation,
2x + 3y = 153,000
Multiplying the first equation with 3 and the second equation with 2,
21x + 6y = 685,500
4x + 6y = 306,000
Subtracting,
17x = 379,500
x = 22,323.53
Substituting in one of the equation,
y = 36,117.65
Hence the cost of each large and small van are 22,323.53 and 36,117.65 respectively.
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On the coordinate plane below, plot and label each point.
The points are plotted and labeled in the graph.
What are coordinates?Coordinates are a pair of integers (Cartesian coordinates), or occasionally a letter and a number, that identify a certain place on a grid, often referred to as a coordinate plane.
Given:
A graph of the coordinate plane.
The points are (0, 2), (-3, 4), (4, -6), (6, -2), (5, 5), (-3, -5), (0, -4), (4, 0), (5, 0), and (3, -6).
The points are plotted and labeled in the graph.
The required graph is given in the image below.
Therefore, all the coordinates are plotted in the graph.
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100 points and brainliest!!!!! 2 multiple choice questions!!!!!!! you dont have to answer both if you dont want to
Answer: answer to 2nd mcq
Step-by-step explanation:
For (-6, 0): -6 + 3(0) = -6 + 0 = -6 ≥ -8 [true]
For (-1, -2): -1 + 3(-2) = -1 - 6 = -7 ≥ -8 [true]
For (-5, -1): -5 + 3(-1) = -5 - 3 = -8 ≥ -8 [true]
Use the distributive property to write two different expressions equal to 72
Each expression should be the product of a number and a sum. Show you
Using Distributive Property, the two expressions that is equal to 72 are
3(10+14) and 4(5+13).
What are expressions exactly?
In mathematics, expressions are mathematical claims that consist of at least two sentences that contain numbers, variables, or both, and are linked by an operator in between. The operations includes sum, Difference, multiplication, and division. For instance, x + y is an equation in which the words x and y are separated by an addition operator. In mathematics, there are two types of expressions: numerical expressions, which include only numbers, and algebraic expressions, which contain both numbers and variables.
Now,
The expressions using distributive property can be
3(10+14)=3*10+3*14
=30+42
=72
4(5+13)=4*5+4*13
=20+52
=72
Hence,
the two expressions that is equal to 72 are 3(10+14) and 4(5+13).
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this is my question
The correct answer is B. 2
Find the value of each of the following :
(a) 6 1/5 % of 1.35 ml
(b) 56 7/8 % of 810m
(c) 0.56% of 15 000 L
(d) 2000% of 5￠
The value of each of the following:
(a) 0.0837 ml
(b) 460.68 m
(c) 84 L
(d) 100￠
What is percentage?The denominator of a percentage (also known as a ratio or fraction) is always 100. Ram, for instance, would have received 30 out of a possible 100 points if he had received 30% on his arithmetic test.
For 6 1/5 % of 1.35 ml
⇒ 6 1/5 % = 31/5 %
⇒ 31/5 % of 1.35 ml
= 31/(5×100) × 1.35 ml
= 0.0837 ml
For 56 7/8 % of 810 m
⇒ 56 7/8 % = 455/8 %
⇒ 455/8 % of 810 m
= 455/(8×100) × 810 m
= 460.68 m
For 0.56% of 15 000 L
⇒ 0.56% of 15 000 L
= 0.56/100 × 15 000 L
= 84 L
For 2000% of 5￠
⇒ 2000% of 5￠
= 2000/100 × 5￠
= 100￠
Hence, the answers are as follows:
(a) 0.0837 ml
(b) 460.68 m
(c) 84 L
(d) 100￠
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