Answer:
The answer is
Step-by-step explanation:
Estimating Sums of Single Digit Numbers
Which of the following represents the most accurate estimation of 4 + 8? is the answer 5, 10, 20 or 25
Answer:
Option C 
Step-by-step explanation:
we have

Remember that


therefore



It is 1/1000 or 1/10∧-3
that is because whenever there is a negative exponent put it as the denominator and the numerator by default, if there isn't any, should be one.
so put it under and then figure it out