Answer:
19.
Step-by-step explanation:
You said 1 out of 1000 get it so i will try doing the simple math 8+11 which would give you 19. Hopefully this is correct.
2^2 , or 4
since the exponents have the same base, we can subtract the exponent of the numerator by the exponent in the denominator.
So 2^-3 - 2^-5 = 2^(-3-(-5)) = 2^2
The new exponent is 2 because -3-(-5) is equal to 2.
If the question was -20.48 divided by -4 then the answer is 5.12