A) 7.7 ft
b) 13.4 ft
c) 10.3 ft
d) 12.3 ft

D. 12.3 ft

Step-by-step explanation:

This problem requires the use of trigonometric ratios. This one specifically uses the cosine ratio as it provides the hypotenuse and is asking for the side that is adjacent to the angle.

cos(40°)=a/16

cos(40°)×16=a/16×16

cos(40°)×16=a

a=12.256 ft

The length of side a is D. 12.3 ft.

you should at least use a calculater

step-by-step explanation:

7

step-by-step explanation:

the answer would be 7