I need help with finding the surface area of all except the ones i crossed out. even if you help with a few of them it'll still be helpful. i'm terrible at this

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

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

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t