What is the easiest way to add negative fractions?

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

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5