Ron buys a lawnmower for $1,500. The salesperson says the value will depreciate about 30% per year over the next few years. However, his neighbor says it is likely to depreciate about $300 per year.

Which system could be used to determine when the two depreciation models will give the same value for the lawnmower?

Question

Ron buys a lawnmower for $1,500. The salesperson says the value will depreciate about 30% per year over the next few years. However, his neighbor says it is likely to depreciate about $300 per year.

Which system could be used to determine when the two depreciation models will give the same value for the lawnmower?

likeabossssssss · Answer

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dumbcow · Answer

well the 2 models are linear and exponential:
Linear model
$$V = 1500 -300t$$
exponential model
$$V = 1500(1-0.3)^t = 1500(0.7)^t$$
To find when they give same value, set 2 equations equal and solve for t
$$1500(0.7)^t = 1500 - 300t$$
Unfortunately you will have to estimate since there is no way to solve this algebraically
If this is a calculus course, i would use newtons method for approximating zeros

Otherwise graph both functions and estimate where they intersect

jaedyn · Answer

HI

bonnieisflash1.0 · Answer

need some help