Jim is driving down the highway at 65 miles per hour. After Jim has driven 15 miles, Joan enters the highway at the same place Jim did and begins driving at 70 miles per hour

Noel is hoping to make a profit (in $) on the school play and has determined the function describing the profit to be f(t) = 8t – 2654, where t is the number of tickets sold. what does the number 8 tell you?