What is the area of the shaded portion to the nearest hundredth? Enter the answer in the box.

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.