2 raise to the power -4 times 2 raise to the power 5

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

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

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?