Question

Danica is arranging flowers for a party. On each table, t, there will be a vase of 9 flowers and 3 bowls of flowers with f flowers inside. Danica needs an additional 12 flowers for a cake topper. This situation can be written as the following expression:

9t + (3f)t + 12

How many flowers should Danica purchase if she has 21 tables with 3 flowers in each bowl?
69
189
378
390

Answer 1

On this question, we can use the order of operations. ( pemdas )

First, we must fill in the missing numbers.
9*21 + (3*3)21 + 12

Start in the parentheses.
(3*3)21 = 9*21 = 189
189+189+12

The rest is just addition now!
189+189+12=390

390 is the correct answer.

Answer 2

The correct answer is D. 390