Which linear relationship is modeled by the cost function f(x)=8x+3, with x representing the number of hours?
1. the cost of renting a bicycle is $8 per hour plus $3 for metal helmet
2.the cost of renting a bicycle is $8 plus for the helmet rental.
3.the cost is $11
4.the cost of renting a bicycle is $8 for helmet rental plus $3 per hour.
