3 years ago

On the last math test in Decker's class, 17 out of 25 students scored an 80 or higher. Which

1 answer:

3 0

Answer: 68%

Reasoning: To find the experimental probability, we divide the number of students that scored an 80 or higher by the total number of students, so 17/25

17/25 = 0.68 x 100 = 68%

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Answer:

$cos(C) =\frac{40}{41}\\\\cos(C)=0.976$

Step-by-step explanation:

To find the $cos (C)$ we must use the cosine theorem.

The cosine theorem says that:

$c^2 = a^2 +b^2 -2abcos(C)$

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$c=AB = 9$

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$9^2 = 40^2 +41^2 -2(40)*(41)cos(C)$

$9^2- 40^2- 41^2 =-2(40)*(41)cos(C)$

$cos(C) = -\frac{9^2- 40^2- 41^2}{2(40)*(41)}$

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