Posted by **Jessica** on Tuesday, April 19, 2011 at 4:48pm.

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?

Also .......

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?

- Math -
**Henry**, Wednesday, April 20, 2011 at 3:31pm
a. C = 45 + 70*1 = $115 = Cost.

b. 45 + 70X = $150,

70X = 150 - 45 = 105,

X = 1.5h.

Jessica, check your 4-18-11,2:45pm post

- Math -
**ho le chong**, Monday, June 2, 2014 at 5:41pm
sooka my dik

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**Ping Pong Ding Dong**, Thursday, June 12, 2014 at 11:02am
sook me hary bllz

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**Anonymous**, Wednesday, September 24, 2014 at 8:58am
slope of the line through A(2, 6) and B(8, -1)?

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