Pleasee help me due next week but its 100 questions

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

Select the conic section that represents the equation. 3x2 + 3y2 -2x + 4 = 0

Solve the system of equations using the linear combination method. {4x−3y=127x−3y=3 enter your answers in the boxes.