Answer:
81
9 times 9 is 81
-98-31 can also be written as
(-98) + (-31)
We know 98+31=129
Therefore -129
Set up two equations: one for the amount of money collected, and one for the number of tickets sold (people who attended).
Let a= adults
Let s= students
Money equation:
Ticket equation:
Now just solve the system of equations for s:
420 Students attended
Answer:
he would have to work 28 hours
Step-by-step explanation: