A single bus ticket costs $1.55. A book of twelve tickets cost $17.20. How much do you save by buying the book of tickets?

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?