Write 81+72 as a proudect using gcf as one of the factors

What is the first step of an indirect proof of a number that is divisible by two

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)