A first-class postage stamp was $0.02 in 1885. The same first-class postage stamp in 2006 was 39¢. What is the percent of increase in the cost of a first-class postage stamp?

What's the inverse function of f (x) = 3+1/2

Robert needs to cut four shelves from a board that is 2.5 meters long. The second shelf is 18 centimeters longer than twice the length of the first shelf. The third shelf is 12 centimeters shorter than the first shelf.

The length a rectangle is 4 feet less than three times the width, and the area of a rectangle is 55 ft.? find the dimensions of the rectangle

A cuboid has a square base of side x cm. The height of the cuboid is (x + 4) cm. The volume of the cuboid is 150cm cubed. Show that x cubed + 4x cubed = 150

You roll a six-sided die. How likely is it that you roll a number less than 6? A) certain B) likely C) unlikely D) impossible

What is the multiplicative inverse of 10/3?

A binomial is multiplied by a third degree trinomial. what degree must be in order for the product to have a degree of 5?

Find the mean (average) the data set below? 2 18 28 5 4' 5'10'20

412.638 in expanded form using decimals

What's 67% as a decimal?