What is the formula used to determine the volume of a prism? a) area of the base ÷ height. b) area of the base · height. c) perimeter of the base · height. d) perimeter of the base · area of the base · height

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

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?

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great