Richard and Teo have a combined age of 39. Richard is 3 years older than twice Teo's age. How old are Richard and Teo

How do you find the percent of a whole

In the Pythagorean theorem (a + b2 = c), a and b stand for the lengths of the shorter sides, and c stands for A. the length of the legs B. the area of the triangle c. the length of the longest side D. the height of the triangle

Solve. 164+56-[3+4+1]=

How to find the lowest common denominator

Naya is four less than twice her brother's age. Naya is eighteen years old. Which equation can we use to solve for her brother's age?

Write a formula for the area A of a parallelogram.

Pedro and Natalia play the trumpet. Pedro practiced 3/4 of an hour last night. Natalia practiced for 1/2 an hour. Who practiced longer?

What is the answer? Kim and Cyndi are starting a business tutoring students in math. They rent an office for $400 per month and charge $40 per hour per student.

There are nine balls. One is slightly lighter than the rest; the difference is small enough that you can't tell just by picking them up.

A cone-shaped building has a height of 11.4 meters and a base with a diameter of 12 meters. The building will be filled with road salt that costs $20 per cubic meter. How much will it cost to fill the building with road salt? Use 3.14 for π.