The diameter of a circle is 10cm. Find the circumference in terms of pi

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 25, a standard deviation of 2.5, and margin of error of 5%