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2 years ago

What does this mean 100 decreased by 77 mean

Mathematics

1 answer:

Daniel [21]2 years ago

5 0

Answer: It just means 100 - 77% which equals to 23%.

Decreased means reduced or basically taking away a percentage of something. In this case it's numbers in math.

Hope this helps!

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2 years ago

From the lighthouse 1000 ft above sea level the angle of depression to boat a is 29 degress.a little bit later the boat moved cl

AnnyKZ [126]

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Since we have given that

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Angle depression to boat 'a' = 29°

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Consider ΔABC,

$\tan 44\textdegree=\frac{AB}{BC}\\\\\tan 44\textdegree=\frac{1000}{BC}\\\\BC=\frac{1000}{\tan 44\textdegree}\\\\BC=1035.53\ feet$

Now, Consider, ΔABD,

$\tan 29\textdegree=\frac{AB}{BD}\\\\\tan 29\textdegree=\frac{1000}{BD}\\\\BD=\frac{1000}{\tan 29\textdegree}\\\\BD=1804.04\ feet$

We need to find the distance that the boat moved in that time i.e. BC

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$DC=BD-BC\\\\CD=1804.04-1035.53\\\\CD=768.51\ feet$

Hence, the boat moved 768.51 feet in that time .

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3 years ago