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issacbeecherpebpyl
20.01.2021 •
Mathematics
Bank of America charges a monthly maintenance fee of $13 and a check writing fee of $0.07 per check. Last year, Andres wrote 289 checks from his account at Bank of America. What was the total of all fees he paid on that account last year?
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Ответ:
2.4x + 4.8y = 2880
y = 2x
2.4x + 4.8(2x) = 2880
2.4x + 9.6x = 2880
12x = 2880
x = 2880/12
x = 240 <== there were 240 standard version downloads
y = 2x
y = 2(240)
y = 480...there were 480 high quality version downloads