Problem a rectangle has a width of 10 centimeters. the rectangle's length is 4 times its width. what is the perimeter of the rectangle?

The diameter of a table is 5 feet. what is the circumference

What is the interquartile range of this data set? 2, 5, 9, 11, 18, 30, 42, 48, 55, 73, 81

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g