The postal service charges $2 to ship packages up to 5 ounces in weight and $0.20 for each additional ounce up to 20 ounces. After that they charge $0.15 for each additional ounce.
What is the domain of this relation?

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

The figures below are made out of circles, semicircles, quarter circles, and a square. find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations).

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?