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lyudmila [28]
2 years ago
12

Systems of Equations:

Mathematics
1 answer:
faust18 [17]2 years ago
4 0
v_b-the\ speed\ of\ the\ boat\\v_c-the\ speed\ of\ the\ current\\\\v_b+v_c=\frac{210}{10}=21\ (mph)\\\\v_b-v_c=\frac{210}{70}=3\ (mph)\\\\  +\left\{\begin{array}{ccc}v_b+v_c=21\\v_b-v_c=3\end{array}\right\\-----------\\.\ \ \ \ \ \ 2v_b=24\ \ \ \ /:2\\.\ \ \ \ \ \ \ \ \ v_b=12\ (mph)\\\\12+v_c=21\\v_c=21-12\\v_c=9\ (mph)

Answer:\\the\ speed\ of\ the\ both\ is\ 12mph\\the\ speed\ of\ the\ current\ is\ 9mph
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Find the sum of the following infinite sequence: 8, 2, .5, …
lubasha [3.4K]
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10.67

Explanation:
The given series is a geometric series:
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Comparing the general form with the given, we would find that:
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We can double check using another term as follows:
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