Marco is selling floral arrangements. Each arrangement uses 1 vase and 11 orchids. Each case cost Marco $4.00. Let C be the total cost of the arrangement and r be the cost of 1 orchid. Which equation should Marco use to find the total cost

A. 11 = C + 4r

B. 11C = r + 4

C. C = 4r + 1

D. 11r + 4

1. The information given in the problem is:

- Each arrangement uses 1 vase and 11 orchids.

- Each case cost Marco $4.00.

- C: the total cost of the arrangement.

- r: the cost of 1 orchid.

2. Therefore, you must multiply the cost of 1 orchid by the 11 orchids that he uses in e ach arrangement, and then, you must add the cost of 1 vase, as below:

C=11r+4

3. Finally, you can conclude that the correct answer is the last option:

D) C=11r+4