1. Evaluate each expression by replacing x with 4. a) x + 5
b) 3x
c) 2x – 1
d) 2
e) 3x + 1
f) 20 – 2x

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

Darian wants to build a regulation size pool table that is 9 feet in length. he plans he ordered are 18 by 36 inches. what is the scale factor of the dilation he must use to build a regulation pool table

Julie was able to walk 16 km through the zoo in 6 hours. how long will it take her to walk 24 km through the zoo?