Question

Kim purchased white vases, red vases, and flowers to create centerpieces for an event. The flowers cost a total of $318 and each vase cost $11. If w and r represent the number of white and red vases purchased, respectively, which of the following expressions represents the total cost of the centerpieces?
l. 11w+11r+318
ll. 11(w+r+318)
lll. 11(w+r)+318
lV. 11w+r+318
I.
II.
III.
IV.
A.
I, II, and III only
B.
II and IV only
C.
I only
D.
I and III only

Answer 1

Total cost = cost of vases + cost of flowers = 11w + 11r + 318.

I: 11w+11r+318 — correct.
II: 11(w+r+318) = 11w+11r+3498 — incorrect.
III: 11(w+r)+318 = 11w+11r+318 — correct.
IV: 11w+r+318 leaves r unmultiplied — incorrect.

Answer: D (I and III only).