Cos=adjacent/hypotenuse
Cos30=x/20
x=cos30 *20
Sorry I don’t have a calculator right now
When (2x-20)＋86＝0
2x-20＝-86
2x＝-46
x＝-23
The answer is C) 1/7 of 3.
Because all others are correct and this one is incorrect.
Answer: A
Explanation do Pythagorean theorem and find the third side. Then do adjacent/hypotenuse.
