What is the answer of Shelly read 1/2 hour each afternoon for 9 days. How many hours did Shelly spend reading in all 9 days?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?