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schepotkina [342]
4 years ago
5

An employee working in a machine shop is exposed to three different sources which emit noises at 81 dB, 91 dB, and 88 dB. What i

s the combined noise level exposure?

Mathematics
1 answer:
leonid [27]4 years ago
5 0
Hello,
Please, see the attached file.
Thanks.

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What is the measure of angle b
tigry1 [53]

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9514 1404 393

Answer:

  a) BE = 5; DE = 6; EF = 4

  b) ∠EFC ≅ ∠DA.F ≅ ∠BDE  or  <em>b = e = f = i</em>

Step-by-step explanation:

Each short segment is the same length as the marked one it is parallel to.

  E is the midpoint of BC, so BE = EC = 5.

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As we have noted, AB║EF and DE║A.F, so corresponding angles and alternate interior angles are congruent. <em>b = e = f = i</em>

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The blade length is the radius of the circle formed by the area swept by the blades to the nearest square foot, what is the area
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