Question

Artie sells ice cream from a cart. The items, their prices, and the quantity sold on an average day are shown on the table. Which expression is equivalent to five days of ice cream sales

Answer 1

The 3 variable in this question are the item, their prices, and the quality. using these three variable we get the equation
P1x + P2y + P3z
as we are counting 5 days worth of ice cream sales, that expression must be multiplied by 5 before it is complete
5(P1x + P2y + P3z) 
that is your expression 
:)

Answer 2

4.5a + 4b + 2.25c

1.75a + 2.25b + 2.75a + 2.25c + 1.75b =

4.5a + 4b + 2.25c

As a result

5(4.5a + 4b + 2.25c)