27
18
----
45
GCF of 45 = 15
Here is a word document on Greatest Common Factors and how to solve it.
Answer:
lol that's 14 points my boy
Let x = the unknown angle
sine of an angle is measure of the opposite leg divided by the hypotenuse.
sin x = 10/21
To now solve for x, we so the inverse of sine.
sin⁻¹(10/21) = x
Plug this into your calculator.
x ≈ 28.44 degrees. This would round down to 28 degrees, option B is your answer.