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pav-90 [236]
3 years ago
10

What percent of 84 is 21

Mathematics
2 answers:
dlinn [17]3 years ago
6 0
25% because 21 is a quarter of 84. And 21 times 4= 84, so 21 is 25% of 84.
alexdok [17]3 years ago
5 0
We set up a proportion: 21/84= ?/100

Cross multiply: 84*?= 21*100
⇒ ?= 21*100/84= 25

25% of 84 is 21.
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Consider the given right triangle. If angle B = 43 degrees and c = 26.7 meters, find a.
Nady [450]

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A right angled triangle can be solved if at least one side and an angle are available. In this question we shall apply the trigonometric ratios since we have one angle which shall be the reference angle (43°). Also we have an hypotenuse (the side facing the right angle) and an unknown side which is the adjacent (which lies between the right angle and the reference angle).

Cos B = Adjacent/Hypotenuse

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Cos 43 x 26.7 = a

0.7314 x 26.7 = a

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a ≈ 19.5  (rounded to the nearest tenth)

Therefore the length of side a equals 19.5 metres.

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Answer:

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Hope this helps!

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2 years ago
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