Simplify the expression (9 + 21) (9 - 21).

Jason, Kendra, and Amanda collect stamps. Jason has x stamps. Kendra has 12 stamps more than Jason. Amanda has three times as many stamps as Kendra. Altogether, they have 123 stamps.

Find the product of (2x) ^2

A cd usually sells for 16.00. if the cd is 30% off, and sales tax is 6%, what is the total price of the cd, including tax?

The number 16 is increased to 17.

Jaden gave away 1/2 of her money on monday. He then gave away 1/3 of what was left on Tuesday. On Wednesday, she spent 1/4 of his remaining money. What fraction of her original money does he have left

860 meters of wire are used to build a wire fence around a square lot. How long is one side of the lot

Two airplanes left an airport at the same time traveling in opposite directions. One travels at a speed of 190 miles per hour. The other travels 210 miles per hour. How long will it take for the planes to be 2000 miles apart?

Use the shell method to find the volume of the solid generated by revolving the regions bounded by the curves and lines about the y-axis. y = x^2, y = 10 - 9x, x = 0, for x ≥ 0

Which expressions are equivalent to - 2y-8+4y

what is the scientific notation of 0.0008235