If you subtract 13 from my number and multiply the difference by -5, the result is -100. What’s my number?

Your number is 33.

Step-by-step explanation:

Your number is x.

(x-13)*-5 = -100

-5x+65=-100

5x = 165

x = 33

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

rounding to the nearest thousandth would be 452,000