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hodyreva [135]
3 years ago
5

How do you get that m

Mathematics
1 answer:
Otrada [13]3 years ago
8 0

Answer:

What?

Step-by-step explanation:

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I really don’t get it
posledela

<em>you just add 8 + 8 + 8 it equals </em><u><em>24. rounded it will be 20</em></u>

<u><em>--------------------------------------------------</em></u>

<u><em>im pretty sure thats how you do it if not sorry</em></u>

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136.08 hope this  helps
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Montano1993 [528]
Recall your d = rt.

so hmm is about the same as the other one... so say the boat has a speed rate of "b", well, going downstream the boat goes say " b + 2 ", because the current is adding to it, and going upstream is " b - 2 " because the current is eroding from it.

So if the whole trip took 14 hours, say it took "t" hours going upstream, then going downstream it took the slack or " 14 - t ".

Also notice, the trip forth and back is the same 45 miles.

\bf \begin{array}{lccclll}&#10;&\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\&#10;&------&------&------\\&#10;Upstream&45&b-2&t\\&#10;Downstream&45&b+2&14-t&#10;\end{array}&#10;\\\\\\&#10;\begin{cases}&#10;45=t(b-2)\implies \frac{45}{b-2}=\boxed{t}\\\\&#10;45=(b+2)(14-t)\\&#10;----------\\&#10;45=(b+2)\left( 14- \boxed{\frac{45}{b-2}}\right)&#10;\end{cases}&#10;\\\\\\&#10;\cfrac{45}{b+2}=14- {\cfrac{45}{b-2}}\implies \cfrac{45}{b+2}=\cfrac{14(b-2)~-~45}{b-2}

\bf \cfrac{45}{b+2}=\cfrac{14b-28-45}{b-2}\implies \cfrac{45}{b+2}=\cfrac{14b-73}{b-2}&#10;\\\\\\&#10;45(b-2)=(b+2)(14b-73)\implies 45b-90=14b^2-45b-146&#10;\\\\\\&#10;0=14b^2-90b-56\implies 0=7b^2-45b-28&#10;\\\\\\&#10;0=(7b+4)(b-7)\implies b=&#10;\begin{cases}&#10;-\frac{4}{7}\\\\&#10;\boxed{7}&#10;\end{cases}
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