Help pls I will give u a Brainliest and a free cookie

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

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

X+y=-4 x-y=2 use elimination with adding and subtraction