SAT Math Practice Question #40399 - SATify | SATify

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SAT Math Practice Question #40399 - SATify | SATify

#40399

trigonometry

triangle

hard

75 sec

In triangle ABC, $∠ C = 9 0^{\circ}, A B = 10, and cos (B) = \frac{4}{5}$ . What is the length of side AC?

A.

6

B.

7

C.

8

D.

9