There is a step missing from the solution below. Which equation is the missing step?
P-10 -0.011x + 13
5 - 10 - 10.011x + 13
-5--0.011x + 13
?
12 -0.01 1x
1091 x
A. 12 -0.011x +13
B. 25 -0.011x + 169
C. 25 - 30.01 1x +13
O
D. 25 -0.011x +13

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