posted by Jessica .
A plumber charges $45 for a service call, plus $70/h for her time.
a. Find the cost of a two hour service call.
b. How long was a services call that cost $150?
as the weight held by a spring increases, the length of the spring increase proportionally. suppose a 2-lb weight stretches a spring to 15 in., and a 12-lb weight stretches the same spring to 20 in. what is the length of the spring with no weight attached?