The distributive property (the 5 is distributed to both the x and -7)
In my opinion I would use the mean. But the options that are given I would choose answer A. But I'm not 100% sure.
Answer:
1.) $10.50 + $3.50n
2.) Replace the variable with the given number. In this case, the given number is 20.
n = 20
$10.50 + $3.50(20)
$10.50 + $70 = $80.50
So, the total cost to visit the fair is $80.50.