Posted by mdan on Saturday, October 12, 2013 at 11:05am.
The Number Two Plumbing Co. charges $45 per hour plus a fixed service call charge of $65. Write an equation that will allow you to compute the total bill for any number of hours, x, that it takes to complete a job.
A. C = 45x + 65
B. C = 65x + 45
C. 65x + 45C = 0
D. 45x + 65C = 0
A business purchases a copier for $5,500 and anticipates it will be worth $2,500 after 10 years. Use straightline depreciation to find a linear model for the depreciated value V of the copy machine after t years of use.
A. V = 5,500 + 300t
B. V = 300  5500t
C. V = 300 + 5500t
D. V = 5,500  300t

maths  Steve, Saturday, October 12, 2013 at 11:09am
#1. Since there is a fixed charge of $65, you know that there will be a "...+65" in the solution. That leaves only (A)
#2 Since the value starts at $5500, you know the solution will have "5500..." in it. That leaves only (D)
See whether you can justify the rest of the solution.

maths  Kelsi, Saturday, October 12, 2013 at 11:13am
A for the 1st one, 45 dollars per hour, x, is 45x. The fixedservice is a onetime thing so it's c = 45x + 65.The 2nd one is D. The original cost of the copier is 5,500. 55002500 = 3000. This is the cost reduction over the ten years. 3000/10 is 300: The amount it gets reduced by every year. For D, when you plug in 10, you get 2,500.

maths  mdan, Saturday, October 12, 2013 at 11:22am
thanks much Steve and Kelsi
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