Answer:
$(160 + 19 n) is the expression to represent the total cost for two days for n students .
Step-by-step explanation:
Let total number of student who went to the planetarium = n
Expenses of the FIRST DAY:
Transportation Price = $70
and ticket per head = $11
So, the price for ticket for n students = 11n
So, total expense for First day = $(70 +11 n)
Expenses of the SECOND DAY:
Transportation Price = $90
and ticket per head = $8
So, the price for ticket for n students = 8n
So, total expense for First day = $(90 + 8 n)
Hence, Total cost for TWO DAYS
= Expense of 1st day + Expense of 2nd day
= ( $70 +11 n) + ($90 + 8 n) = $(160 + 19n)
Hence, $(160 + 19n) is the expression to represent the total cost for two days .