Question

http://prntscr.com/4zs0qb

Answer 1

easy to find a number which you add with -5 and equal = -15
may be that number give you 15 but not negative sign
then try to find number if you subtract that and that gives you = -15
let me know if you know any number

Answer 2

and another way is to subtract your exponent that they gave you with -15

Answer 3

did you find any
what you get when you subtract 5 with your total exponent ???

Answer 4

@Gokuporter

Answer 5

20??? idk

Answer 6

-15 - (-5) = is what

Answer 7

-15 + 5 = -10
so when you do
-5-10 its become -15
so your missing exponents is -10