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10.11.2019 •
Mathematics
Suppose you are thinking about buying one of two cars. car a will cost $17,655. you can expect to pay an average of $1230 per year for fuel, maintenance and repairs. car b will cost about $15,900. fuel maintenance and repairs for it will average about $1425 per year. after how many years are the total costs for the cars the same? a. 5 years c. 9 years b. 7 years d. 11 years
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Ответ:
We wish to know when A=B so:
15900+1425y=17655+1230y subtract 15900 from both sides
1425y=1230y+1755 subtract 1230y from both sides
195y=1755 divide both sides by 195
y=9
So in 9 years both cars would cost the same.
Ответ: