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ahrayia [7]
3 years ago
10

Please somone help me 40 points will mark brainliest

Mathematics
2 answers:
cestrela7 [59]3 years ago
7 0

Answer:

the answer is in the picture below

Step-by-step explanation:

Andreas93 [3]3 years ago
4 0

1. We're doubling to go from ABDC to A'B'D'C'.  So AB=15 becomes A'B'=30 cm and BD=8 becomes B'C'=16 cm.  Please see attached figure.

2. We have equal ratios

40:50:60 = 30:37.5:45

Let's check that.  30/40=3/4, 37.5/50=3/4, 45/20=3/4, all ratios the same, similar triangles.

We see the meets of the longest side and the shortest side are B and Z respectively.

The meets of the longest side and the medium side are C and X.

The meets of the short side and medium side are A and Y.

Pairing them up we have our

Answer: ABC ~ YZX

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Petes boat can travel 48 miles upstream in 4 hours. The return trip takes 3 hours. Find the speed of the boat in still water and
tankabanditka [31]
So... hmm bear in mind, when the boat goes upstream, it goes against the stream, so, if the boat has speed rate of say "b", and the stream has a rate of "r", then the speed going up is b - r, the boat's rate minus the streams, because the stream is subtracting speed as it goes up

going downstream is a bit different, the stream speed is "added" to boat's
so the boat is really going faster, is going b + r

notice, the distance is the same, upstream as well as downstream
thus   \bf \begin{cases}
b=\textit{rate of the boat}\\
r=\textit{rate of the river}
\end{cases}\qquad thus
\\\\\\

\begin{array}{lccclll}
&distance&rate&time(hrs)\\
&----&----&----\\
upstream&48&b-r&4\\
downstream&48&b+4&3
\end{array}
\\\\\\

\begin{cases}
48=(b-r)(4)\to 48=4b-4r\\\\
\frac{48-4b}{-4}=r\\
--------------\\
48=(b+r)(3)\\
-----------------------------\\\\
thus\\\\
48=\left[ b+\left(\boxed{\frac{48-4b}{-4}}\right) \right] (3)
\end{cases}

solve for "r", to see what the stream's rate is

what about the boat's? well, just plug the value for "r" on either equation and solve for "b"
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Step-by-step explanation:

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