## 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 5x^{2} + 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, 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?

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

**Correct Answer: D**

### More ACT Math Exam Questions

- 1In the figure below, is a diameter of the circle and m ∠BAC = 35°. Find the measure of arc .
- 2Five cans of tomatoes cost $6.50. At this rate, how much will nine cans of tomatoes cost?
- 3For all xy ≠ 0, and when both x and y are greater than 1, the expression equals which of the following?
- 4Which of the following is NOT the graph of a function
- 5In the figure below, a cone is shown, with dimensions given in
centimeters. What is the total surface area of this cone, in square
centimeters? (Note: The total surface area of a cone is given by the
expression πr
^{2}+ πrs, where r is the radius and s is the slant height.)