What number will...
1. Make x-5 = 0?
2. Make x+3 = 0?

1. x = 5

              2. x = -3

Step-by-step explanation:

1. x - 5 = 0

  x = 5

2. x + 3 = 0

   x = -3

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.