Answer:
700
Step-by-step explanation:
4(175)=700
I need helppp quickkkk
The triangles QRS and TUV are similar. They are similar as ΔTUV = 3ΔQRS.
What are triangles?
Triangles are a particular sort of polygon in geometry that have three sides and three vertices. Three straight sides make up the two-dimensional figure shown here. An example of a 3-sided polygon is a triangle. The total of a triangle's three angles equals 180 degrees. One plane completely encloses the triangle.
There are two similar looking triangles, ΔQRS and ΔTUV.
In ΔQRS, the measure of line segment QR = 9 units
In ΔQRS, the measure of line segment RS = 10 units
In ΔQRS, the measure of line segment QS = 11 units
In ΔTUV, the measure of line segment TU = 27 units
In ΔTUV, the measure of line segment UV = 30 units
In ΔTUV, the measure of line segment TV = 33 units
The pattern here can be seen that -
For the line segment TU -
3 (QR) = TU
3 (9) = 27
Similarly, for the line segment UV -
3 (RS) = UV
3 (10) = 30
Similarly, for the line segment TV -
3 (QS) = TV
3 (11) = 33
Therefore, the triangle TUV is three times scaled version of triangle QRS.
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Gas mileage is the number of miles you can drive on a a gallon of gasoline. A test of a new car results in 460 miles on 20 gallons of gas. How far could you drive on 50 gallons of gas? What is the car's gas mileage?
Answer:
1,400
Step-by-step explanation:
y=mx+b
plug in 460 for b
y=mx+460
plug 20 for m
y=20x+460
and when graphed on a graph you would see the answer
Which statement is true about the function f(x)=4x-4
Answer: The statement that is true about the function f(x)=4x-4 is:
It is a linear function, as it is a straight line in the form of y=mx+b where m is 4 and b is -4
The y-intercept of this line is -4, which means when x=0, y=-4
The slope of this line is 4, which means for every 1 unit increase in x, y increases by 4 units
The domain of this function is all real numbers and the range is all real numbers except -4
The equation of the line is y = 4x - 4
The graph of this function is a line with a slope of 4 and y-intercept of -4.
Step-by-step explanation:
what is the vale of the expression 3devided by 3/4
Answer:
Step-by-step explanation:
0.25
What is the 4 sequence in math?
The four types of Sequence are Arithmetic Sequence , Geometric sequence , Harmonic Sequence and Fibonacci Sequence .
What is a Sequence ?
The Sequence is defined as an arrangement of objects or a set of numbers in a particular order which are followed by some rule .
The Four Types of Sequences are :
(i) Arithmetic Sequence : It is defined as a type of sequence in which every term of the series is created by adding or subtracting a fixed number to preceding number .
(ii) Geometric Sequence : It is defined as a type of sequence in which every term is obtained by multiplying or dividing a fixed number with the preceding number .
(iii) Harmonic Sequence : It is defined as a type of sequence in which the reciprocals of the terms follows the Arithmetic Progression .
(iv) Fibonacci Sequence : It is defined as a type of sequence in which every element is obtained by adding the two preceding elements and the sequence starts with 0 and 1 .
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Which of the following is the equation of the circle with center C and a point P on the circle, as shown in the graph?
(x – 4)2 + (y + 5)2 = 10
(x + 2)2 + (y – 3)2 = 10
(x – 2)2 + (y + 3)2 = 100
(x + 4)2 + (y – 5)2 = 100
The equation of the circle center, C(2, -3), with the point on the circle, P(-4, 5), is the option;
(x - 2)² + (y + 3)² = 100What is the standard form of the equation of a circle?The standard form of the equation of a circle is presented as follows;
(x - h)² + (y - k)² = r²
Where;
(h, k) = The coordinates of the center of the circle
r = The length of the radius of the circle
The location of the specified center of the circle, C = (2, -3)
The location of the point P = (-4, 5)
The radius of the circle found using the distance formula used for finding the distance between two points is therefore;
r = √((-4 - 2)² + (5 - (-3))²) = √((-6)² + (8)²) = 10
The radius of the circle, r = 10
Therefore;
The center of the circle, (h, k) = (2, -3)
The equation of the circle = (x - 2)² + (y - (-3))² = 10²
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What are the 4 coordinates of a graph?
The four coordinate plane quadrants don't have names but are simply known as the first quadrant, second quadrant, third quadrant, and fourth quadrant
example of coordinate
Take into account that the midpoint in between the points (x1,y1) and (x,2y,2) is given by:
xo = (x1 + x2)/2
yo = (y1 + y2)/2
in this case you have
(x1,y1) = (4,-4)
(xo,yo) = (6,-1)
by using the expression for xo and yo, you can find the values of the coordinate of point B, as follow:
xo = (x1 + x2)/2
2xo = x1 + x2
x2 = 2xo - x1
x2 = 2(6) - 4
x2 = 8
yo = (y1 + y2)/2
2yo = y1 + y2
y2 = 2yo - y1
y2 = 2(-1) - (-4)
y2 = 2
Hence, the coordinates of point B is
(xo,yo) = (8,2)
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The ratio of in-states to out-states visitors at the zoo is approximately 7 to 3. If 2000 people visited the zoo, about how many people were from out the state?
The number of people visited the zoo from the state is 200
How to determine the number of people?Number deals with quantity of people that came to the zoo from the state over the period. These people must be from the state.
The given parameters that will help us to solve the question are:
The ratio is approximately 7 to 3.
The number of people = 2000
The sum of the ratios is equal to 7+3 = 10
This is to say that 10% of the people visited the zoo
10/100*2000/1
Therefore about 200 people visited the zoo
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A 8 foot ramp leads from the ground to the tailgate of a truck and forms a 35° angle with the the ground. Find the height of the tailgate from the ground
The height of the tailgate (from the ground), holding the 8 ft ramp inclined at 35° with the ground, found using trigonometric ratios is about 4.59 ft
What are trigonometric ratios?A trigonometric ratio (trig ratio) specifies the relationship between an angle in a right triangle and two sides of the right triangle.
The length of the ramp = 8 ft
The angle the ramp forms with the ground = 35°
The ramp leads from the ground to the tailgate of the truck
The height of the tailgate from the ground can therefore be found using trigonometric ratios as follows;
The trigonometric ratio for the sine of an angle, θ, using SOH CAH TOA therefore is; sin(θ) = Opposite side
Where;
θ = 35°
The opposite side to the angle θ = Height of the tailgate from the ground = h
The hypotenuse side of the right triangle formed by the ramp = The length of the ramp = 8 ft. We get;
sin(35°) = (Height of the tailgate from ground, )/(Length of the ramp)
Therefore;
sin(35°) = h/8
h/8 = sin(35°)
h = 8 × sin(35°) ≈ 4.59
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100 POINTS:
Can someone convert the following to standard form? (Shown work is not required but appreciated"
1. The function f(x) = (x+5)(x-9) in standard form is x²-4x-45.
2. The function f(x) = (x+4)² in standard form is x²+8x+16.
3. The function f(x) = (x+2)²-25 in standard form is x²+4x-21.
4. The function f(x) = 4(x-2)² in standard form is 4x²-16x+16.
5. The function f(x) = 6(2x+1)² in standard form is 24x²+24x+6.
6. The function f(x) = 3(x+4)(x-5) in standard form is 3x²-3x-60.
7. The function f(x) = (x+10)²-100 in standard form is x²+20x.
8. The function f(x) = 9-(x+1)² in standard form is -x²-2x-8.
9. The function f(x) = 2(x+5)²+10 in standard form is 2x²+20x+60.
What is the standard form?
A linear equation can also be written in standard form, slope intercept form, and point slope form.
The formula for standard form is Ax+By=C.
The first function is y = f(x) = (x+5)(x-9).
Simplifying the equation -
f(x) = (x+5)(x-9)
x(x-9)+5(x-9)
x²-9x+5x-45
x²-4x-45
Therefore, the standard form is x²-4x-45.
The second function is y = f(x) = (x+4)².
Simplifying the equation -
f(x) = (x+4)²
Follow the formula - (a+b)² = (a²+2ab+b²)
(x)²+2(x)(4)+(4)²
x²+8x+16
Therefore, the standard form is x²+8x+16.
The third function is y = f(x) = (x+2)²-25.
Simplifying the equation -
f(x) = (x+2)²-25
Follow the formula - (a+b)² = (a²+2ab+b²)
[(x)²+2(x)(2)+(2)²]-25
x²+4x+4-25
x²+4x-21
Therefore, the standard form is x²+4x-21.
The fourth function is y = f(x) = 4(x-2)².
Simplifying the equation -
f(x) = 4(x-2)²
Follow the formula - (a-b)² = (a²-2ab+b²)
4[(x)²-2(x)(2)+(2)²]
4[x²-4x+4]
4x²-16x+16
Therefore, the standard form is 4x²-16x+16.
The fifth function is y = f(x) = 6(2x+1)².
Simplifying the equation -
f(x) = 6(2x+1)²
Follow the formula - (a+b)² = (a²+2ab+b²)
6[(2x)²+2(2x)(1)+(1)²]
6[4x²+4x+1]
24x²+24x+6
Therefore, the standard form is 24x²+24x+6.
The sixth function is y = f(x) = 3(x+4)(x-5).
Simplifying the equation -
f(x) = 3(x+4)(x-5)
3[x(x-5)+4(x-5)]
3[x²-5x+4x-20]
3[x²-x-20]
3x²-3x-60
Therefore, the standard form is 3x²-3x-60.
The seventh function is y = f(x) = (x+10)²-100.
Simplifying the equation -
f(x) = (x+10)²-100
Follow the formula - (a+b)² = (a²+2ab+b²)
[(x)²+2(x)(10)+(10)²]-100
x²+20x+100-100
x²+20x
Therefore, the standard form is x²+20x.
The eighth function is y = f(x) = 9-(x+1)².
Simplifying the equation -
f(x) = 9-(x+1)²
Follow the formula - (a+b)² = (a²+2ab+b²)
9-[(x)²+2(x)(1)+(1)²]
9-x²-2x-1
-x²-2x-8
Therefore, the standard form is -x²-2x-8.
The ninth function is y = f(x) = 2(x+5)²+10.
Simplifying the equation -
f(x) = 2(x+5)²+10
Follow the formula - (a+b)² = (a²+2ab+b²)
2[(x)²+2(x)(5)+(5)²]+10
2[x²+10x+25]+10
2x²+20x+50+10
2x²+20x+60
Therefore, the standard form is 2x²+20x+60.
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You have 2.88 meters of copper wire and 5.85 meters of aluminum wire. You need 0.24 meter of copper wire to make one bracelet and 0.65 meter of aluminum wire to make one necklace. Can you make more bracelets or more necklaces? Explain.
Answer: You can make more bracelets than necklaces. ✅
Step-by-step explanation:
You have 2.88 meters of copper wire and 5.85 meters of aluminum wire.
With 2.88 meters of copper wire, you can make 12 bracelets because each bracelet needs 0.24 meters of copper wire.
With 5.85 meters of aluminum wire, you can make 9 necklaces because each necklace needs 0.65 meters of aluminum wire.
So you can make 12 bracelets and 9 necklaces.
Therefore you can make more bracelets than necklaces.
Which of the following is a constant polynomial?a.4x+1b. 3c. 2x2d. 6x+3
A constant polynomial is a polynomial with a degree of 0, meaning it has no variable terms. The only possible constant polynomial is the term with a coefficient of 3, which is 3.
This can be seen by looking at the formula for a polynomial, which is:
P(x) = a0 + a1x + a2x2 + ... + anxn,
where a0 is the constant term, a1 is the linear term, a2 is the quadratic term, and so on. Since this polynomial has no variable terms (x = 0), the only possible constant polynomial is the term with a coefficient of 3.
To calculate the value of a constant polynomial, you simply substitute 0 for x in the equation above. For example, in the polynomial 3, the value would be 3 when x = 0.
P(0) = 3
Therefore, the answer is option b, 3.
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HELP THIS IS DUE TOMORROW!!!!
Since the fourth quarter of 2014, the flash storage capacity of smartphones has grown by approximately 12 gigabytes a year. The average flash storage in 2014 was 15.9 gigabytes.
a. Write an equation to represent this situation , defining both variables .
b . Assuming the trend continues , write a one - varia equation that can be used to find the average f storage capacity of smartphones in 2025 .
C. Solve your equation from Part B.
D. Interpret the solution
Answer:
A. c = 15.9 + 12(y - 2014)
B. c = 15.9 + 12(2025 - 2014)
C. 147.9 gigabytes
D. Unsure what you meant
Step-by-step explanation:
A. In this equation, 'c' represents the flash storage capacity in year 'y' and '15.9' is the flash storage capacity in year 2014. '12' represents the yearly increase in storage and '(y-2014)' represents how many years have passed from 2014.
B.To find the average flash storage capacity of smartphones in 2025, we can use the equation:
c = 15.9 + 12(y - 2014)
We can substitute 'y' with 2025 in the above equation to find the average flash storage capacity of smartphones in 2025
C.
c = 15.9 + 12(2025 - 2014)
c = 15.9 + 12(11)
c = 15.9 + 132
c = 147.9 gigabytes
This graph represents a quadratic function. What is the function’s equation written in factored form and in vertex form? Graph shows upward parabola plotted on a coordinate plane. The parabola has vertex at (2, minus 8) with the left slope at (0, 0) and the right slope at (4, 0). f(x) = x(x − ) f(x) = (x − )2 +
The quadratic equation written in the vertex form is:
f(x) = 2*(x - 2)^2 - 8
How to find the equation of the parabola?We know that for any parabola whose vertex is (h, k) and the leading coefficient is a, can be written in the vertex-form as:
f(x) = a*(x - h)^2 + k
In this particular case, we know that the vertex of the parabola is the point (2, -8), replacing that in the quadratic equation above we will get:
f(x) = a*(x - 2)^2 - 8
Now we also know that our parabola passes through the point (0, 0), then if we replace these values in the equation we will get:
f(0) = 0 = a*(0 - 2)^2 - 8
0 = a*4 - 8
8 = a*4
8/4 = a
2 = a
Then the quadratic equation in the vertex form is:
f(x) = 2*(x - 2)^2 - 8
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PERSEVERE ABCD is a parallelogram with side lengths as indicated in the given figure. The perimeter of ABCD is 22. Find AB.
The value of side AB is 6 units for parallelogram ABCD with perimeter is 22 units.
What is an equation?An equation is an expression that shows how two or more numbers and variables are related to each other. Types of equations can either be linear, quadratic or cubic
Parallelogram is a quadrilateral (four angles and sides) in which opposite sides are equal and parallel.
From the diagram:
AB = DC (opposite sides are equal)
2y + 1 = 4 - 4w
2y + 4w = 3 (1)
AD = BC (opposite sides are equal)
3x - 2 = x - w + 1
2x + w = 3 (2)
The perimeter of ABCD is 22:
2(AB + AD) = Perimeter
2(2y + 1 + 3 - 4w) = 22
2(2y - 4w + 4) = 22
4y - 8w + 8 = 22
4y - 8w = 14 (3)
From the three equations:
w = -0.5, x = 1.75, y = 2.5
AB = 2y + 1 = 2(2.5) + 1 = 6 units
The value of side AB is 6 units
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Identify the initial amount a and the rate of decay r (as a percent) of the exponential function f (t)=475(0.5)^t . Evaluate the function when t=3 . Round the answer to the nearest tenth
When t = 3, the exponential function has a value of 59.375.
What is exponential function?The exponential function is a mathematical function denoted by f(x)=\exp or e^{x}. Unless otherwise indicated, the word refers to a positive-valued function of a real variable, however it can be extended to complex numbers or applied to other mathematical objects such as matrices or Lie algebras. A mathematical function of the following type is an exponential function: f (x) = an x, where x is a variable and an is a constant known as the function's basis. The transcendental number e, which is about 2.71828, is the most often encountered exponential-function base.
Here,
Given the exponential function h (t) = 475(0.5)^t
When t = 3
h(3) = 475(0.5)^3
h(3) =59.375
h(3) = 59.375
The exponential function when the value of t is 3 is 59.375.
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The sum of Lisa's age and Myra's age is 40. In 10 years, Lisa will be 3
times as old as Myra. How old is each person now?
Answer:
Lisa: 35Myra: 5Step-by-step explanation:
You want Lisa's and Myra's ages if the sum of their ages is 40 and in 10 years, Lisa will be 3 times as old as Myra.
10 years henceThe current sum of their ages is 40. In 10 years, 10 will be added to each of their ages, so the sum will be 60.
At that time Lisa's age is 3 times Myra's age, so will be 3/(3+1) = 3/4 of the total.
Lisa's age in 10 years = (3/4)(60) = 45
Lisa is 35 now, and Myra is 5 now.
__
Additional comment
We could write some equations, but we find a mental solution based on ratios to be quick and easy. Here is a solution using equations:
L + M = 40
(L +10) = 3(M +10) . . . . . . age relation in 10 years
(40 -M) +10 = 3M +30 . . . . substitute for L
20 = 4M . . . . . . . . . add M-30
M = 5; L = 40-M = 35
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If using the method of completing the square to solve the quadratic equation x^2+2x+16=0x , which number would have to be added to "complete the square"?
The number that would complete the square is 1.
What is the completing the square method?We know that the method of completing the square would involve a quadratic equation that does have the general form;
ax^2 + bx + c =0
We have to note that the number that is going to complete the square is the number that is going to correspond to 1/2(b).
This implies that we have to look at the b term in the equation and we b = 2.
Thus;
1/2(2) = 1
Hence, we have found that the square can be completed by 1.
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What is the coefficient of X²Y in the product 7x² 5y X² 3y?
The coefficient of x²y in the product ( 7x²-5y) ( x²+3y) is 16.
The coefficient of x²y in the product (7x²-5y) (x²+3y) is the numerical factor that is multiplied to x²y when the two polynomials (7x²-5y) and (x²+3y) are multiplied together.
To find the coefficient of x²y in the product, you can use the distributive property of multiplication over addition, also called the FOIL method, which states that to multiply two binomials, you must multiply the first term of the first binomial by the first term of the second binomial, the first term of the first binomial by the second term of the second binomial, the second term of the first binomial by the first term of the second binomial, and the second term of the first binomial by the second term of the second binomial.
The product of (7x²-5y) (x²+3y) can be expanded as follows:
(7x²-5y) (x²+3y) = 7x²x² + 7x²3y -5yx² -5y3y
=7x⁴ + 21x²y -5x²y - 15y²
= 7x⁴ + 16x²y - 15y²
So, the coefficient of x²y in the product ( 7x²-5y) ( x²+3y) is 16.
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Give a algebra equation to represent this pattern
The equation m = 4w + 3 shows the number of days in January.
What is linear equation?Equations whose variables have a power of one are called linear equations. One example with one variable is where ax+b = 0, where a and b are real values and x is the variable.
Given:
A pattern shown in the image.
Let m is the number of days in a month.
And w represents the number of days in the weeks.
So, algebraic equation,
m = 4w + 3.
Therefore, the equation is m = 4w + 3.
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Determine if the following system of
equations has no solutions, infinitely
many solutions or exactly one solution.
2x + 5y = 4
-4x - 13y
=
-9
One solution exists for the given equation.A linear equation with one variable has only ever one solution.
What is an unique solution?A linear equation with one variable has only ever one solution. The unique solution of a linear equation is the location at which LHS and RHS are identical when substituted.
The solution must be an ordered pair when there are two linear equations operating simultaneously (x, y). In this case, the ordered pair will fulfill the set of equations.
Given:
2x + 5y = 4
-4x - 13y = 9
Now,
a 1 = 2, b1 = 5 , = -4
a2 = -4 , b2 = -13, = 9
Now, = 2 / -4
= 5 / -13
As, a1/ a2 = 2/-4
b1 / b2 = 5 /-13
Thus, the relationship mentioned above reflects intersecting lines.
So, there is only one solution to the given problem.
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PLEASE HELP
Select all the right angles.
Find the measures of x and y.
X=
Y=
Answer:
x = 92
y = 92
Step-by-step explanation:
164 + 102 + 90 + x + x = 540
2x + 356 = 540
2x = 184
x = 92
What is the function of for loop explain with example?
For loop is a type of looping structure that is used in programming to repeat a sequence of codes until a certain condition is met.
What is function?In mathematics, a function is a relation between a set of inputs and a set of outputs, such that each input is related to exactly one output. Functions are often represented as mathematical expressions, or as a graph or table. The input to a function is known as the argument, while the output is known as the value. Functions are used to describe physical phenomena, and to model relationships between different variables.
It is commonly used to go through each element in an array or a list without having to write the same code multiple times. For example:
// Initialize array
int arr[] = {1, 2, 3, 4, 5};
// For loop to print out each element in the array
for (int i = 0; i < 5; i++) {
System.out.println(arr[i]);
}
In this example, the for loop will print out each element of the array until it reaches the condition that i is less than 5, which is the length of the array.
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Find the value of r so that the line through (r,5) and (6,r) has a slope of 5/8
PLEASE HELP ASAP!!
The linear equation for a line made of points (r,5) and (6,r) has slope = 5/8 so r=5.
What is a linear equation ?
A linear equation is an equation in which the highest power of the variable is always 1. It is also known as a one-degree equation. The standard form of a linear equation in one variable is of the form
Ax + B = 0
e.g. x-10=0. Here, x is a variable, A is a coefficient and B is constant.
The standard form of a linear equation in two variables is of the form
Ax + By = C
e.g. 2x-4y=10. Here, x and y are variables, A and B are coefficients and C is a constant.
Now,
As slope (m)=(y2-y1)/(x2-x1)
and m=5/8, (x1,y1) and (x2,y2) are (r,5) and (6,r)
Therefore, 5/8=(r-5)/(6-r) --> 5(6-r)=8(r-5)--->13r=70-->r=5
Hence,
r=5
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I really need help . 28.25 x 9.60
Answer:
271.2
Step-by-step explanation:
Write it down and remove the decimals and do long multiplication. After that, count the decimal points and add them back ro the answer
Answer:
271.2
Step-by-step explanation:
move the decimal point 2 places to the right in the two numbers and multiple
[tex]2825 \times 960 = 2712000 [/tex]
and then move you decimal point 4 places to the left so your finally answer should be 271.2
what does -2/3 slope look like on a graph
On solving the provided question, we can say that the provided slope is -2/3 equation of line 2x + 3y -7 = 0
what is slope?A line's slope determines how steep it is. A mathematical equation for the gradient is called "gradient overflow" (the change in y divided by the change in x). The slope is the ratio of the vertical change (rise) between two points to the horizontal change (run) between those same two spots. When a straight line's equation is written as y = mx + b, the slope-intercept form of an equation is employed to express it. The y-intercept is located at a location where the line's slope is m, b is b, and (0, b). For instance, the slope of the equation y = 3x - 7 and the y-intercept (0, 7).The line's slope is m. b is b at the point where the y-intercept is, and (0, b). As an illustration, the equation y = 3x - 7 has a slope of 3, and its y-intercept is (0, 7).
the provided slope is -2/3
let us assume x1 = 2 and y1 = 1
equation of line =>
y-1 = -2/3(x-2)
y-1 = -2x/3 + 4/3
3y-3 = -2x + 4
2x + 3y -7 = 0
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What are the 3 ways in math?
Step-by-step explanation:
Today, we are going to be talking about the three-way principle of mathematics. Basically, there are three ways to solve a problem in math: verbally, graphically, or by example. In this lesson, we will discuss each of these principles by solving sample problems using each type.
The length of a rectangle is 4yd longer than its width. If the perimeter of the rectangle is 40yd , find its area.
The area of rectangle is found to be 117 sq. yd.
Define the term perimeter of the rectangle?If you simply know the width and height, you can easily search all four sides, since two of them are equal to each of the height as well as the width. Add the results after dividing the height and breadth by two.Let the length of rectangle be L:
The, the width is W + 4 = L
Perimeter = 2(length + width)
P = 2(L + B)
P = 2(W + 4 + W)
P = 2(2W + 4)
40 = 4W + 4
4W =36
W = 9
The, L = 9 + 4 = 13 yd.
Area = length * width
Area = 9*13
Area = 117
Thus, the area of rectangle is found to be 117 sq. yd.
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Answer:
Step-by-step explanation:
What is perimeter of a Rectangle:The perimeter of a rectangle is the total circumference of the rectangle.
Perimeter=2(Length + breadth)
Perimeter=40yd
Length=x+4 and breadth=x
40=2(x+x+4);
40=4x+8;
4x=32 and x=8yd
So, length=12yd and breadth=8yd.
Area = length*breadth
So Area = 12*8= 96ydsq
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Plez I need help with this math question
when graphing inequalities, we use an open point when the sign is greater or less than when the sign is ,and a closed point when the sign is greater or less than or equal to
Graph following inequalities.
1) x≥3
2) x<-2
3) x< 7
4) x ≤ -4
explanation
To find the equation of a linear function from its graph:
Find the slope by finding the rise and run.
Find the y-intercept (the point where the line crosses the y-axis)
Substitute the value into the function f(x)= mx+b .
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