What property is being shown? 3 + x + b= 3 + b + x a. Associative
b. Commutative
c. Symmetric

Factor the polynomial 8y^2 - 72 btw "^" means exponent

Through non-collinear points there is exactly one plane.

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?