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3 years ago

Help me plzzzzzzzzzzzzzzzz ughhhhhhhhhhh

Mathematics

2 answers:

aleksandr82 [10.1K]3 years ago

5 0

<h3>Answer: 60</h3>

=====================================================

How to get this answer:

The triangles are similar so the horizontal sides divide to get some ratio R

R = (long horizontal)/(short horizontal)

R = h/45

At the same time, the slanted sides divide in a similar fashion to get the same ratio R

R = (long slanted)/(short slanted)

R = (17+51)/(51)

R = 68/51

------------

Because we have the same R value, we can set the fractions equal to one another. Then we can isolate h

h/45 = 68/51

51*h = 45*68 ... cross multiply

51*h = 3060

51h/51 = 3060/51 ... divide both sides by 51

h = 60

Mila [183]3 years ago

3 0

Sksksks i think 147 feet

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now, when coming down, the return trip, well the length is the same, so the distance is also 100miles, it only took 2hrs though, because, the boat wasn't coming down "b" fast, it was coming down " b + c " fast, because the current was adding speed to it, so it came down quicker

now, recall your d = rt, distance = rate * time

$\bf \begin{array}{lccclll}
&distance&rate&time\\
&-----&-----&-----\\
upstream&100&b-c&5\\
downstream&100&b+c&2
\end{array}
\\\\\\
\begin{cases}
100=(b-c)5\\
\qquad \frac{100}{5}=b-c\\
\qquad 20=b-c\\
\qquad 20+c=\boxed{b}\\
100=(b+c)2\\
\qquad 50=b+c\\
\qquad 50=\boxed{20+c}+c
\end{cases}$

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