Chole bought 5 sets of books. each set has the same number of books. she donated 8 of her books to her school. now she has 22 books. how many books were in each set? show all mathematical thinking.

How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?