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pentagon [3]
2 years ago
14

Help, Please, will give 20 points and brainiliest. URGENT!

Mathematics
1 answer:
777dan777 [17]2 years ago
7 0

Answer:

Step-by-step explanation:

b = 21 is the base, a is the height

area = 0.5ab = 210

ab = 420

a = 420/b = 420/21 = 20 ft

length of hypotenuse = √(a²+b²) = √(20²+21²) = √841 = 29 ft

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UNO [17]

Answer:

x = 10

Step-by-step explanation:

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30x+ 45 = 21x + 135

<em><u>(subtract 21x from 30x; subtract 45 from 135)</u></em>

9x = 90

<em><u>(divide 90 by 9)</u></em>

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<h2>Another solution:</h2>

2x/3 + 1 = 7x/15 + 3

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<u><em>(multiply everything in the equation by 15, then simplify)</em></u>

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<u><em>(subtract 7x from 10x; subtract 15 from 45)</em></u>

3x = 30

<em><u>(divide 30 by 3)</u></em>

x = 10

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3 years ago
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3 0
3 years ago
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8 0
1 year ago
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