How to solve place values again?

Call it n places.  

Step-by-step explanation:

Determine if the digit falls to the right or left of the decimal point. If the digit falls to the left of the decimal point, then it is in the 10^(n-1) place, so to find the place value of the digit, we multiply the digit by 10^(n - 1). hope this helps you :)

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation:

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.