The book Key to Robinsons New University Algebra was written by author Daniel W Fish Here you can read free online of Key to Robinsons New University Algebra book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Key to Robinsons New University Algebra a good or bad book?
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6. Let n= the number of days the first person travels, d=lj and l=:l ■^{n — l)d=n. . «=q(1 + n) = the whole distance. and 15(w-6)= « " hence, in{l+n) = 15(n-6\ or, n' + w=30n— 180, n'-29n=-180. First person travels. n = Y=t-V-= 9 or 20, -6 -6, Second « ** 3 or 14, Ans, Explanation. — Call the first person A, and the second B. Now B overtakes and passes A after A has traveled 9 days and B 3 days. But as A is increasing his rate one mile per day, he finally gains on B, and overtakes and passes hi...m after A has traveled 20 days, and B 14. They are together after having trav- eled 45 and 201 miles. 6. Let x=: one of the equal payments. At the given rate per cent $60 will amount to $61 at the end of 60 days. As the rate of interest is ^-^^^ of the principal for a day, the firet partial payment will amount to the second to ^+3loo-^» the third to ^+3lJo^, and the last to x. Hence the sum of the partial payments is, Q0x-\-^j\^{59x-\-58x + 5lz. . . . +x), or by summing the series, 60^ + tVo^' Since the debt is to be canceled, we must have 60a- + T¥o^= 61, T259ar=7320, whence ^=^1t2J7» ^^' (292) ARITHMETICAL PROGRESSION.
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