If arccos (√3 / 2) = β, then cos β = adjacent side / hypotenuse = √3 / 2. This tells us immediately that the adjacent side length is √3 and the hypotenuse is 2. Via the Pythagorean Theorem, we know that the third side is 1.

This information rules out the 1st and 3rd answer choices.

Because cos 30° = adj / hyp = √3 / 2, we can conclude that the correct answer is the 4th one: 30°, 60°, 90°

5 0

3 years ago

What is 10% of 50? <br> A. 6.75<br> B. 7.5<br> C. 10.5 <br> D. 5.25

nirvana33 [79]

Its 5. Its none of those.

10% of 50.00 = 5.0000

5 0

3 years ago

0.01x - 0.3y = 1

Phantasy [73]

Answer: your answer would be

x-30y=100 and 10y = x - 20

Step-by-step explanation:

6 0

3 years ago

Which expression is equivalent to (144k^2r^14)1/2 for all positive values of k and r?

FrozenT [24]

Answer: B

Step-by-step explanation:

4 0

2 years ago