Question 21 Answer and Explanation _ACT April 2008 Form 65D Math Section

Question 21 Answer and Explanation _ACT April 2008 Form 65D Math Section

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21. In right triangle △XYZ below, cos Z = $\frac{4}{7}$ Which of the following expressions is equal to cos X ?

A. $\frac{7}{4}$

B. $\frac{\sqrt{65}}{4}$

C. $\frac{\sqrt{33}}{4}$

D. $\frac{\sqrt{65}}{7}$

E. $\frac{\sqrt{33}}{7}$

Answer and Explanation

Your Answer is

Correct Answer is E

Explanation