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Question 6(Multiple Choice Worth 2 points) (01.02) 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

Respuesta :

kachielo
By substituting the numbers into its own variable of t and f, the equation should now be 9(21)+(3*3)*21+12. This simplifies to 189+(9*21)+12 --> 189 +189 +12, which equals 390.
qnguyenc
Well, we can substitute the variables and get : 
9(21)+3(3)(21)+12
Then we simplify :
189+189+12
To get :
390 flowers

By the way you might be confused like I was for it said "a cake topping," whilst I assumed all tables had cake toppings which is untrue and I nearly ended up with 630 flowers.