Troy measured the button on his jacket. Then he calculated that it has a circumference of 31.4 millimeters. What is the button's radius?

Use 3.14 for .

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.