Question

David is selling floral arrangements. Each arrangement uses 1 vase and 12 roses. Each vase costs David $2.00. Let C be the total cost of the arrangement and r be the cost of 1 rose. Which equation should David use to find the total cost of each arrangement?

C = 12r + 2
C = 2r + 12
12C = r + 12
12 = C + 2r

Answer 1

If 1 rose costs r dollars, how much do 12 roses cost?
What operation do you do to find that out?

Answer 2

I dont know

Answer 3

example :
if 1 orange costs $2, then 5 oranges cost 5(2) = $10
you multiply
so if 1 rose costs r, then 12 roses cost ??

Answer 4

1 rose costs r dollars
2 roses cost r + r = 2 * r = 2r dollars
3 roses cost r + r + r = 3 * r = 3r dollars
4 roses cost r + r + r + r = 4r dollars
5 roses cost 5r dollars
6 roses cost 6r dollars
etc.
11 roses cost 11r dollars
12 roses cost ?

Answer 5

I can't explain it any easier then that ^^

Answer 6

12 r dollars

Answer 7

Correct.
The 12 roses cost 12r dollars.
That is only part of the total cost. The other part of the cost is the vase.
The vase costs $2, and that cost of $2 has to be added to the 12r cost of the roses.
Which expression in the choices shows that C, the cost, is $2 added to 12r?