What is the percent of decrease from 600 to 90 ??

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

Select the number of ways in which a line and a circle can intersect

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.