Answer:
A, 40.16
Step-by-step explanation:
cosθ = adjacent (BC) / hypotenuse (AB)
cos 17° = BC / 42
BC = 40.16
[tex]\boxed{BC = 40.16}[/tex]
Cos 17 = [tex]\frac{adjacent}{hypotenuse}[/tex]
Where adjacent = BC, hypotenuse = 42
0.959 = [tex]\frac{BC}{42}[/tex]
BC = 0.959 * 42
