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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

For which of the following values of c will there be 2 distinct real solutions to the equation 5x2 + 16x + c = 0?

(A)3 (B) 9 (C) 14 (D) 15 (E) 20

Correct Answer: A

In the circle below, O is the center and measures 5 inches from chord . The area of the circle is 169π square inches. What is the length of , in inches?

(A)12 (B) 13 (C) 18 (D) 24 (E) 26

Correct Answer: D

In the figure below, image is a line segment and all distances are given in inches. What is the ratio of the area of quadrilateral RBCS to the area of quadrilateral SCFT? image

(A)9:7 (B) 7:9 (C) 11:13 (D) 11:39 (E) 11:50

Correct Answer: D

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