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2 years ago

12

Gordon answered 80% of the questions on the exam correctly. He answered 24 questions correctly. Enter the total number of questi

ons on the exam.

1 answer:

murzikaleks [220]2 years ago

3 0

24/.8=30................

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In triangle ABC, a = 9, c = 5, and angle B = 120°. Find the measure of angle A to the nearest degree. Show your work.

slamgirl [31]

<u>Answer:</u>

Angle A = 39°

<u>Step-by-step explanation:</u>

We are given that there is a triangle ABC where a = 9, c = 5 and angle B = 120° and we are to find the measure of angle A.

But first we need to find the side b using the law of cosine:

$b^2 = a^2 + c^2- 2a*c*cos(120)$

$b^2 = 81 + 25 - 2*9*5*(-0.5)$

$b=\sqrt{151}$

Now finding angle A using law of cosine:

$cos(A) = \frac{b^2+c^2-a^2}{2b*c}$

$cos(A) = \frac{151+25-81}{2*12.29*5}$

$cos A=0.7730$

$A=39.38$

Therefore, the measure of angle A = 39°.

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Troyanec [42]

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X = -1*-3

X = 3, negative times negative equals positive.

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Determine the quotient of 2/5 divided by 3/4.

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Step-by-step explanation:

2/5 ÷ 3/4

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