Question

Identify BR rounded to the nearest tenth. HELP PLEASE!!

Answer 1

BR ≈ 49.0

Explanation:

Use cosine:

`cosine=(adjacent)/(hypotenuse)`

We have

`adjacent=42\\hypotenuse=BR\\\alpha=31^o`

`\cos31^o\approx0.8572`

Substitute:

`(42)/(BR)=0.8572`

`(42)/(BR)=(8,572)/(10,000)` cross multiply

`8,572BR=420,000` divide both sides by 8,572

`BR=(420,000)/(8,572)`

`BR\approx49.0`