Manuel has four pieces of bubble gum. His friend gives him nine more pieces. By what percent has Manuel’s amount of bubble gum charged?

In triangle abc, the length of side ab is 12 cm, the length of side bc is 5 cm, and the length of side ca is 9 cm. find the measure of angle a using the law of cosines.

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.