Answer:
The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try! A variable doesn't have to be "x", it could be "y", "w" or any letter, name or symbol.
X COULD BE 2 OR 7
Step-by-step explanation:
Answer:
A. x= -3
Step-by-step explanation:
firstly collect all the terms . then move the term so it'd look like 5x+14 = -2x - 7 then calculate it then it would look like this : 5x+2x = -7 -14 after you move the terms you again calculate it and then the finish product would look like this : 7x = -21 so after you get that you divide by both sides and the answer is -3 . (im sorry if that don't make sense) but the answer is A.
3.
Use the Pythagorean Theorem or knowledge on special right triangles to
find the missing variable in the following triangles.
Part A:
Part B:
45°
9
30v2
45°
30V2
b
Answer:
Part A: [tex]l = 60[/tex], Part B: [tex]b = \frac{9\sqrt{2}}{2}[/tex]
Step-by-step explanation:
The Pythagorean Theorem determines the length of the hypotenuse of right triangle ([tex]r[/tex]) by means of following formula:
[tex]r^{2} = x^{2}+y^{2}[/tex] (1)
Where [tex]x[/tex], [tex]y[/tex] are respective lengths of each leg.
Now we proceed to solve on each triangle:
Part A: ([tex]r = l[/tex], [tex]x = y = 30\sqrt{2}[/tex])
[tex]l^{2} = (30\sqrt{2})^{2}+(30\sqrt{2})^{2}[/tex]
[tex]l^{2} = 3600[/tex]
[tex]l = 60[/tex]
Part B: ([tex]r = 9[/tex], [tex]x = b[/tex], [tex]y = \frac{9\sqrt{2}}{2}[/tex])
[tex]9^{2} = b^{2}+\left(\frac{9\sqrt{2}}{2} \right)^{2}[/tex]
[tex]81 = b^{2}+\frac{81}{2}[/tex]
[tex]b^{2} = \frac{81}{2}[/tex]
[tex]b = \frac{9\sqrt{2}}{2}[/tex]
- Josh and Gerald are having a throwing contest. Josh's first throw landed 20 feet away from the throwing line. They also measured that the
highest point of the throw occurred when the ball was 10 feet away from Josh and 30 feet in the air. Which equation models the path of Josh's
throw?
Answer:
y = -3x^2/10 + 6x
Step-by-step explanation:
Solve the system of equations by graphing. Check your solution. y=-3x+7 3x+y=4
Answer:
Step-by-step explanation:
Answer:
there are no solutions
Step-by-step explanation:
In y=-3x+7, -3 is the slope, and 7 is the y-intercept. In 3x+y=4, this equation also equals -3x+4=y. So, -3 is the slope, and 4 is the y-intercept. Once you graph the equations(as seen in the picture below) you should find where the lines intersect. Although, the lines are parallel since the slopes are the same.
please explain i really don’t understand
Answer:
22.5°
Step-by-step explanation:
First we need to figure out the size of the interior angles on the inside.
The formula of figuring out the total degrees of all the interior angles of any shape is (n-2)×180°.
N is the number of sides.
If we substitute our number of sides (8) we get this:
(8-2)×180°
6×180° = 1080°
Then we divide 1080 by 8 since this is a regular octagon (all angles are equal in a regular shape).
1080° ÷ 8 = 135°
Focusing on the triangle now, we now know that the angle on the tip of the triangle is 135° as it has not been split by the line.
Using the rule of angles in a triangle add up to 180°. We do this sum:
180° - 135° = 45°
There are 2 angles left in the triangle so we do:
45° ÷ 2 = 22.5°
Therefore the angle of x is 22.5°.
For every pound a company spends on advertising, it spends £0.26 on its website. Express the amount spent on advertising to the amount spent on its website as a ratio in its simplest form.
Answer:
Can you convert pounds to dollars?
Step-by-step explanation:
giving out brainliest!!
Answer:
A.
Step-by-step explanation:
x/5 + 2 = 19 x______
Answer:
47x=5
or 5/47
Step-by-step explanation:
Answer:
x=85
Step-by-step explanation:
x/5 + 2 = 19
5(x/5 + 2) = 5(19) *multiply both sides of the equation by 5 to get rid of the fraction
x + 10 = 95
x = 85 *subtract 10 on both sides
Check:
x/5 + 2 = 19
85/5 + 2 = 19
17 + 2 = 19
19 = 19
I REALLY NEED HELP WITH THIS QUESTION
Answer:
$1.75
Step-by-step explanation:
4b+n=12;2b+3n=18.5
Step: Solve4b+n=12for n:
4b+n+−4b=12+−4b(Add -4b to both sides)
n=−4b+12
Step: Substitute−4b+12fornin2b+3n=18.5:
2b+3n=18.5
2b+3(−4b+12)=18.5
−10b+36=18.5(Simplify both sides of the equation)
−10b+36+−36=18.5+−36(Add -36 to both sides)
−10b=−17.5
(Divide both sides by -10)
b=1.75
Step: Substitute1.75forbinn=−4b+12:
n=−4b+12
n=(−4)(1.75)+12
n=5(Simplify both sides of the equation)
Answer:
b=1.75 and n=5
The PTA is sponsoring an 8th grade
dance and has asked your help to
select a D.J. for the big event. You
called around and found that Dylan
the D.J. charges a $100 set-up fee plus
$17.50 per hour. Mya's MC Mobile hos a
$125.00 set-up fee, plus $10 per hour.
Which D.J. would you recommend to
the PTA? Be sure to clearly support
your recommendation mothemotically
the monthly revenue for printer ink for a large office supply store is r(x) =-x^2 +12x+13, where x is the price of an ink cartridge in dollars and r(x) is in hundreds of dollars. what is the maximum monthly ink revenue
Answer:
6u77vhy46yvt g vgj v6. hy
Step-by-step explanation:
guv yg
100 points ASAP!
A scale drawing of Julie's living room is shown below:
A rectangle is shown. The length of the rectangle is labeled as length equal to 8 cm, and the width is labeled as width equal to 6 cm.
If each 2 cm on the scale drawing equals 4 feet, what are the actual dimensions of the room?
Length = 16 feet, width = 12 feet
Length = 10 feet, width = 8 feet
Length = 32 feet, width = 24 feet
Length = 14 feet, width = 12 feet
Answer:
Length = 16 feet, width = 12 feet
Step-by-step explanation:
The length is 8 cm. So divide this by 2 to find out how many 2 cm are in 8 cm. You get 4. Multiply 4 x 4 (ft) to find out the real length. This means the length is 16 feet.
Do the same steps with the width. The real length is 12 feet.
Hope it helps!
Answer
First off, nice 100 point scam, don't do it again, because you could get warned or even worse banned, second off Have a great day!
Length = 16 feet, width = 12 feet
Step-by-step explanation:
The length is 8 cm. So divide this by 2 to find out how many 2 cm are in 8 cm. You get 4. Multiply 4 x 4 (ft) to find out the real length. This means the length is 16 feet.
Do the same steps with the width. The real length is 12 feet.
Hope it helps!
Step-by-step explanation:
55% of students spent their trackouts on Netflix. What fraction of students
watched Netflix?
Answer:
11/20
Step-by-step explanation:
11/20
Answer:
55/100
Step-by-step explanation:
Beacsue % only equal %/100
What is 1 and 2/3 in decimal form
Answer:
1.66666667
Step-by-step explanation:
plz mark brainlest
Answer:
1.67
Step-by-step explanation:
Step 1: Multiply the whole number by the denominator:
1 × 3 = 3
Step 2: Add the product you got in Step 1 to the numerator:
3 + 2 = 5
Step 3: Divide the sum from Step 2 by the denominator:
5 ÷ 3 = 1.666667
Which of the following is a true statement?
A. All squares are rectangles.
B. All rectangles are squares.
C. All rhombuses are squares.
A weather station on top of a mountain reports that the temperature is currently 0 degrees Celsius and has been falling at a constant rate of 4 degrees Celsius per hour. What will the temperature be in 5 hours?
Answer:
-20 degrees celsius
Step-by-step explanation:
The temperature is falling so the rate is -4 degrees per hour.
It is five hours so: 5 x -4 = -20 degrees celsius.
An expression is shown below. Which expression is equivalent to the expression shown?
- 2x(x + y - 3) + 3(-x + 4y) + y(3x + 5y - 3)
- 2x2(5y2 + xy + 3x + 9y
- 2x2 + 5y2 + xy - 6x +9y
- 5x2 + 5y2 + xy + 3x + 9y
- 5x2 + 5y2 + xy - 6x + 9y
Note: In option A, it should be "+" instead of "(".
Given:
The expression is
[tex]-2x(x+y-3)+3(-x+4y)+y(3x+5y-3)[/tex]
To find:
The equivalent expression.
Solution:
We have,
[tex]-2x(x+y-3)+3(-x+4y)+y(3x+5y-3)[/tex]
Using distributive property, we get
[tex]=-2x(x)-2x(y)-2x(-3)+3(-x)+3(4y)+y(3x)+y(5y)+y(-3)[/tex]
[tex]=-2x^2-2xy+6x-3x+12y+3xy+5y^2-3y[/tex]
On combining like terms, we get
[tex]=-2x^2+5y^2+(-2xy+3xy)+(6x-3x)+(12y-3y)[/tex]
[tex]=-2x^2+5y^2+xy+3x+9y[/tex]
The expression [tex]-2x^2+5y^2+xy+3x+9y[/tex] is equivalent to the given expression.
Therefore, the correct option is A.
PLZ HELP ME THIS IS 7TH GRADE MATH I NEED HELP ASAP
Step-by-step explanation:
To get the circumference of a circle: 2[tex]\pi[/tex]×radius
Your circle has a given diameter of 3 feet.
To get the radius: 3 ÷ 2 = 1.5
To get circumference of this circle: 2 × [tex]\pi[/tex] × 1.5 = 9.424777961......
Answer:
Approximately 9.424 feet
Answer:
i am in 7th grade as well the answer is 9.42 rounded to the nearset of a tenth would be 9.4
Step-by-step explanation:
first find the radius by doing diameter ÷2
3÷2=1.5
1.5xπ
The measure of the second angle is 15 degrees more then the measure of the 1st angle. The measure of the 3rd angle is 45 degrees more than the measure of the 1st angle. Find the measures of the interior angles in the triangle.
Let the first angle be x
So, second angle = (x+15)°
and third angle= (x+ 45)°
Now,
x+ (x+15) + (x+45)= 180°. ( Triangle sum property)
x+x+x+15°+45° = 180°
3x+ 60° = 180°
3x= 180°-60°
3x= 120°
x= 120°/3
x= 40°
Now,
first angle=x= 40°
second angle = (x+15)°= 40°+15° = 55°
third angle= (x+45)° = 40°+45° = 85°
Hope it helps you. Please mark as brainliest if it does.
The cost of a taxi journey is
£4 plus £3 per mile.
What is the cost of a journey of 7 miles?
A £7
B £21
C £25
D £31
Answer:
its C
Step-by-step explanation:
it's because 3x7 is 21 add 4 to that its 25 and that's your answer
EXPERTS PLEASE HELP!!!!!!!!!!!!!!
Answer:
1. D
2. x=65
Step-by-step explanation:
Hi!
Your answer is D because 78 is 120% of x
120% in decimal point is 1.2.
So it's 1.2x is the same as 120% of x
For question 8:
1.2x=78
Isolate x by divide 1.2 on both sides
78/1.2=65
PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!PLSSSSSSS HELPPPPPPP I WILL GIVE BRAINLIESTTTTTTTTTT!!!!!!!!!!!!!!!!!!
PLSSSS SHOWWW THE WORKKK!!!!
Answer:
no hablo inglés xd no te puedo ayudar
Answer:
y^4/x^2
Step-by-step explanation:
i wish i could show the work but tbh i just use the link i comment under
Its helpful
A CD usually sells for $15.00. If the CD is 10% off, and sales tax is 6%, what is the total price of the CD, including tax?
Answer:
the total price of the CD, including tax is $14.31
Step-by-step explanation:
The computation of the total price of the CD including tax is shown below:
= Sale price - off percentage + sales tax
= $15 - ($15 × 10%) + 6% of the remaining value
= 15 - $1.5 + 6% of the remaining value
= $13.50 + 6% of $13.50
= $13.50 + $0.81
= $14.31
Hence, the total price of the CD, including tax is $14.31
A stick 1 meter long casts a shadow 0.5 meters long. A building casts a shadow 16 meters long. How tall is the building?
Answer:
I think 8
Step-by-step explanation:
i think 8 because if you have 1 meter with .5 a meter shadow then i would think 16 meters would cast half of itself which would be 8
sorry if im totally wrong
PLEASE HELP ME I WILL GIVE YOU BRAINLIEST IF YOU HELP ME PLEASE I REALLY NEED HELP
Answer:
60º
Step-by-step explanation:
they key word here is difference meaning we need to subtract
specifically, we need to subtract 75 from 135 to find the difference in degrees, hence the number of degrees between the two settings:
135º - 75º = 60º
please answer will give brainliest
Answer:
2 Gallons
Step-by-step explanation:
20.5ft x 16.4ft = 336.2
336.2 divided by 200= 168 gallons
Since you can not buy 1.68 gallons you will have to buy 2 galllons instead.
I aint gonna lie this is easy points hehehehe
An investment of £200 increases by 4% each year for 3 years
Calculate the value of the investment at the end of the period.
(Will give brainliest and 10 points)
Answer:
£224
Step-by-step explanation:
Given data
P= £200
R=4%
T=3 years
Simple interest
A= P(1+rt)
Substiute
A= 200(1+0.04*3)
A=200(1+0.12)
A=200*1.12
A=£224
Hence the investment at the end of the period is £224
what is x if :-1/3x-9=2
Answer:
x = -33
Step-by-step explanation:
-1/3 x - 9 = 2 add nine to both sides
-1/3 x = 11 multiply both sides by -3
x = -33
Hope that helps
An angle measures 172° more than the measure of its supplementary angle. What is the measure of each angle?
Step-by-step explanation:
x+ 172= 180-x
x+ 172= 180-x2x= 8
x+ 172= 180-x2x= 8x= 4°
180-4= 176
the angle is 4° and the measure of the other angle is 176°
Answer:
8
Step-by-step explanation:
what is the absoulute value
pls help
thanks so much