Answer:
bro use air math it will give u the answers trust me
Answer:
The sum is equal to 
Step-by-step explanation:
we know that
The formula to calculate the sum is equal to

In this problem
-----> number of terms
a1 is the first term

an is the last term

substitute

Y=9(x^2+3x-x-3)
y=9(x^2+2x-3)
y=9x^2+18x-27
Hot dogs- 4 packs (9 times 4 = 36)
Buns - 3 packs (12 times 3 = 36)