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natali 33 [55]
3 years ago
10

Which proportion can be used to find 45% of 300

Mathematics
1 answer:
Volgvan3 years ago
3 0

100/x=300/45  Factor out  100/x=15×20/15×3  Cancel common factor   100/x=20/3  100(3)=20(x)  300=20x  300/20=X  15=x

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Can anyone help me, i will give brainiest.
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Step-by-step explanation:

1. we need an equation first. the sum of all angles (108°, n°, 2n°) is equal to 180°. we can depict this with the equation: 108°+2n°+n°=180°

2. now we can solve for the missing variable, n.

108°+3n°=180° → subtract both sides by → 3n°=72° → divide both sides by 3 → n=24°

3. now that we know that n=24°, we can solve the value of ∠DOB. we can see that ∠DOB is 2n° which we just plug the number we got for n into the equation. 2*24=48° meaning ∠DOB is 48°

hope this heped! ♡

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