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Vikki [24]
3 years ago
15

Translate the sentence into an equation. Twice the difference of a number and 4 is 9. Use the variable y for the unknown number.

​
Mathematics
1 answer:
gulaghasi [49]3 years ago
6 0

Answer:

2x-4=9

Step-by-step explanation:

2x-4=9

2x=y

2x=13

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What is the solution to y + 8.5 = 17.2? y = 25.7 y = -25.7 y = -8.7 y = 8.7
olya-2409 [2.1K]

Answer:

y =8.7

Step-by-step explanation:

y + 8.5 = 17.2

Subtract 8.5 from each side

y +8.5 -8.5 = 17.2 -8.5

y =8.7


8 0
3 years ago
Read 2 more answers
I need help fast what is 9m−​(3+7​m) simplified?
iogann1982 [59]

Answer:

Simplifying 9m + -3 + -7m = 0

Reorder the terms: -3 + 9m + -7m = 0

Combine like terms: 9m + -7m = 2m -3 + 2m = 0 Solving -3 + 2m = 0

Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right.

Add '3' to each side of the equation. -3 + 3 + 2m = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 2m = 0 + 3 2m = 0 + 3 Combine like terms: 0 + 3 = 3 2m = 3

Divide each side by '2'. m = 1.5

Step-by-step explanation:

Hope this helps :)

4 0
3 years ago
Find all real square roots of −81 .
Lilit [14]
There are no real roots for a negative number, so -81 has no real roots, if the number is 81 however, then the tow roots are 9
3 0
3 years ago
Find the exact value of cos 120° in simplest form with a rational<br> denominator.
IRINA_888 [86]

Given:

cos 120°

To find:

The exact value of cos 120° in simplest form with a rational  denominator.

Solution:

We have,

\cos 120^\circ

It can be written as

\cos 120^\circ=\cos (90^\circ+30^\circ)

\cos 120^\circ=-\sin 30^\circ             [\because \cos (90^\circ-\theta)=-\sin \theta]

\cos 120^\circ=-\left(\dfrac{1}{2}\right)             [\because \sin 30^\circ=\dfrac{1}{2}]

\cos 120^\circ=-\dfrac{1}{2}

Therefore, the exact value of cos 120° is -\dfrac{1}{2}.

7 0
2 years ago
6x−4y=−24<br> 4x−8y=−32 <br><br> What is the ordered pair for both of them?
denis23 [38]
Multiply the first equation by -2 to eliminate a variable so it becomes:
-12x+8y=48
4x-8y=-32
Add them together.
-8x=16
x=-2
Plug it in one equation.
6(2)-4y=-24
12-4y=-24
-4y=-12
y=3
Ordered pair is: (-2,3)
6 0
3 years ago
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