At a party 28 handshakes were exchanged. each person shook hands exactly once with each of the others. how many people were present?

Thea builds the first layer of a rectangular prism using 4 unit cubes. Raj adds 4 more layers of 4 unit cubes each. How many unit cubes are used for the prism

Seventy students are graduating in may. They make up 1/5 of the students population, how many students attend the school.

In krissy's collection, there are 15 action movies and 21 comedies. What is the ratio of qualities to action movies in Krissy's collection? A) 5:7 B) 1:15 C) 15:1 D) 7:5

Which expressions can you use to find 75% of 56?

Peter has only quarters and dimes in his coin collection. If he has three times as many quarters as dimes, which is an expression for the number of quarters he has in terms of the number of dimes?

What number equals 100 when squared?

What are the zeros of f (x) = x^2-8x+15

What is the average speed on a car that travels 800 kilometers in 20 hours?

Solve the following equation. Then place the correct number in the box. 3x + 1 + 5x = 7 + 15 = 7x X =

Party favors are on sale for $2.40 each. You have $380 to spend on the decorations and gifts, and you have already spent $270 on decorating. Write and solve an inequality to find the number of party favors you can buy.