Question

Find the value of x to the nearest tenth. A. 26.3 B. 5.7 C. 9 D. 8.6

Answer 1

C

Explanation:

you have the angle, adjacent and you want to find the hypotenuse

therefore use CAH - (I drew the triangle on the bottom of the attachment )

length of A / cos(angle) = hypotenuse

7 / cos(39)=9.007

Answer 2

C: 9 to the nearest tenth

Explanation:

You have three choices on your calculator to solve this problem. Only 1 of the three will work.

Sin(39)

Tan(39)

Cos(39)

You want the hypotenuse (x) and you are given the adjacent side. The adjacent side is the other side that makes up the reference angle other than the hypotenuse.

Cos(theta) = adjacent side / hypotenuse. The is the function you use.

Adjacent side = 7

Cos(39) = 7 / x Multiply both sides by x

x * Cos(39) = 7 Divide by Cos(39)

x = 7 / Cos(39)

x = 9 Isn't that neat? It is actually 9.0073. but C is the answer.