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JulsSmile [24]
3 years ago
13

A library shelf is 9 feet wide.a set of nature books fill 1/6 of the shelf space. each book in the set is 3/5 inch thick.how man

y books are in a set
Mathematics
1 answer:
Charra [1.4K]3 years ago
4 0
Area filled by nature books = 1/6 of 9 feet = 1/6 x 9 = 3/2 feet.

Number of nature books = 3/2 / 3/5 = 2.5 ≈ 3 books.
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Answer:

Q.1.

Sum of angles of a triangle = 180°

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(3x - 9) + (4x + 15) + 90 = 180

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∠A = 3x - 9 = 3(12) - 9 = 36 - 9 = 27°

∠B = 4x + 15 = 4(12) + 15 = 48 + 15 = 63°

∠A = 27°

∠B = 63°

Q.2.

using \ pythagoras \ theorem \\x^2 = 7^2 + (7\sqrt{3} )^{2} = 49  + 49(3) = 196\\x = \sqrt{196}  = 14

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x = 14

y = 60°

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