Is this right?? someone please help!

Your answer is slightly off.

Step-by-step explanation:

The answer that you should have gotten is;

z^2-x=w

z=w+x/z

z^2=w+x

z^2-x=w

You had multiplied z by 2 instead of squaring it.

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.