Please help ASAP will give out brainliest ( DONT know how to spell lol)

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. n^2 - 49 = 0

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?