What percentage of people live in cities and suburbs? a. 20% b. 40% c. 60% d. 80%

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.