How do you find interest earned

In how many ways can the eight rooks be placed on an 8-by-8 chessboard so that no two rooks can attack one another?

Zack bought a coat for $69.78. He paid with a $100 bill and received $26.73 in change. How much was the sales tax?

F (x) = 3x + 5, g (x) = 6x2 Find (fg) (x).

You have a 10 x 10 x 10 inch cube that is made up of little 1 x 1 x 1 inch cubes. You paint the outside of the big cube red. How many of the little cubes have paint on at least one of their sides? (A) 456 (B) 488 (C) 598 (D) 600 (E) 1000

Which values of a and b make the following equation true? a = 11, b = 7 a = 11, b = 10 a = 28, b = 7 a = 28, b = 10

bobby's grandparents are driving 420 miles to orlando. they drove 185 miles and then stopped for her lunch. about how many more miles do they have to travel

If arc BC = 30°, arc AB = 120°, and arc CD = 120°. what is the measure of APD? 20° 30 40° D) 50°

The sides of a triangle are in the ratio of 3:5:9. The perimeter is 68 inches. how long is each side?

A movie theater conducted a survey to see what customers preferred at the concession stand. the theater asked every fifth person who entered the movie theater every friday for a month what his or her favorite movie snack was.

It takes 12 hours to clean the windows of a certain office building. During the first day of cleaning, the workers were able to clean for 9 hours.