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Svetradugi [14.3K]
3 years ago
11

Andy is flying an airplane that is 12,000 feet in the air.

Mathematics
1 answer:
SOVA2 [1]3 years ago
8 0

Answer:

D   21.80°

Step-by-step explanation:

Let x = measure of the angle

Tan x = 12000/30000 = .4

Arctan .4 = 21.80°

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A chemist has two solutions: a 50% methane solution and an 80% methane solution. He wants 100 mL of a 70% methane solution. How
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Answer:

33.33 mL of 50%

66.67 of 80%

Step-by-step explanation:

Let x = quantity of 50% methane.

Then,

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⇒ 0.50 x + 80 - 0.80 x = 70

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⇒ x=\frac{10}{0.3}

⇒ x = 33.33 mL of 50%

and, 100 - 33.33 = 66.67 of 80%

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3 years ago
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A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 59.
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What is the value of x?
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Answer:

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Step-by-step explanation:

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