Evaluate c=2 *pi symbol* r, for r=8

What is the most accurate measurement of 1 pound

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)