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Umnica [9.8K]
3 years ago
7

TriangleABC has three sides with these lengths: AB=9, BC=40, and CA=41, What is the value of cos C?

Mathematics
1 answer:
Otrada [13]3 years ago
3 0

Answer:

9² = 40² + 41² - 2(40)(41) cos(C)

81 = 1600 + 1681 - 3280 cos(C)

81 = 3281 - 3280 cos(C)

-3200 = -3280 cos(C)

cos(C) = 3200 / 3280

cos(C) = 40 / 41

Step-by-step explanation:

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Answer:

y=2x+3 is non-proportional. y=5x is proportional.

Step-by-step explanation:

y=2x+3 is not proportional because there is the +3. also, when it is graphed on a graph, the line does not pass through the origin/zero.

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Answer:

2 cups of peanut butter

Step-by-step explanation:

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Therefore, for huge batch with 1 cup of oil, she should use 2 cups of peanut butter.

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