Work out the equation of the line which passes through the midpoint of a ( 3 , 5 ) and b ( 5 , 7 ) and passes through the midpoint of g ( -3 , 5 ) and h ( 7 , 0 ). work out the the coordinates pf the midpoint of a different pair of points which the same line passes through.

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