Y=1/2x +-6 on a graph

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

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4