at hoffman's bike rental, it costs $35 to rent a bike for 9 hour. How many dollars does it cost per hour of bike use?

Step-by-step explanation:

This is a straight forward proportion.

9 hours = 35 dollars

1 hour = x

9:1::35:x Cross multiply

9 hour * x = 1 hour * 35 dollars. Divide by 9

9 hour / 9 hour x = 1 hour 35 dollars/9 hour

x = 35/9

x = $3.89 rounded.

Step-by-step explanation:

35 for 9 hours

35 / 9 = 3.88888889, about 3.89 per hour