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Find the value of cos A if angle A is acute and sin A = 7/10

(A)3/10

(B)1/9

(C)7/√51

(D)51/10

(E)√51/10

The Correct Answer
Explanation

The length, in inches, of a box is 3 inches less than twice its width, in inches. Which of the following gives the length, l inches, in terms of the width, w inches, of the box?


(A)l = w + 3 (B)w + 3 (C)w – 3 (D)2w + 3 (E)2w – 3

Correct Answer: E

What is the slope of a line that includes the points (–4, 1) and (10, –6)?

(F) 2(G) (H) (J) (K)

Correct Answer: H

What is the value of when x = -3 and y = -4?

(F) - (G) - (H) (J) (K)

Correct Answer: J

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