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kifflom [539]
3 years ago
6

Helppppppppp ur girl out

Mathematics
1 answer:
meriva3 years ago
8 0
-18 I think.

Vertical Angles are congruent.
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4/5x = -16
Sveta_85 [38]
<h2>Hello!</h2>

The answers are:

1  x=-20

2  x=-9

3 x=-5 

4  r=-2

5  x=-4.5

<h2>Why?</h2>

To know the solution of the problems, we need to isolate each variable.

Remember that:

- If we have an equality: if the number is subtracting (negative sign), and if you need to move it to the other side of the equality, its sign changes to positive.

- If we have an equality: if the number is adding (positive sign), and if you need to move it to the other side of the equality, its sign changes to negative.

- If we have  an equality:  if the number is part of a product , and if you need to move it to the other side of the equality, the same number will be dividing the factors of the side. On the opposite, if the number is dividing, it will be multiplying on the other side of the equality.

So,

1 - Solving for "x"

\frac{4}{5}x=-16\\x=\frac{-16}{\frac{4}{5} }=-16*\frac{5}{4}=-20\\x=-20

2 - Solving for "x"

-3x+4=31\\-3x=31-4=27\\x=\frac{27}{-3}=-9

3 - Solving for "x"

2x+(-12)=-22\\2x-12=-22\\2x=-22+12=-10\\\\2x=-10\\x=\frac{-10}{2}=-5

4  - Finding the solution

25=15-5r\\25-15=-5r\\-5r=10\\r=\frac{10}{-5}=-2

5 - Finding the solution

12.5+5x=-10\\5x=-10-12.5=-22.5\\5x=-22.5\\x=\frac{-22.5}{5}=-4.5

Have a nice day!

8 0
4 years ago
Read 2 more answers
How many solutions does the equation x^2=100 have?
Nataliya [291]

2 and these are x = -10 and x = 10

x^2 = 100 \\ \sqrt{x^2} = \sqrt{100} \\ x = ±10

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I don't really understand what your question is?

Try asking a more specific answer.

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