## 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

A right circular cylinder is shown below, with dimensions
given in inches. What is the total surface area of the cylinder, in
square inches?(Note: The total surface area of a cylinder is given by 2πr^{2} + 2πrh, where r is the radius and h is the height.)

（A）3π （B） 5π （C） 6π （D） 8π （E） 11π

**Correct Answer: D**

Which of the following numbers is an imaginary number?

(A) (B) (C) - (D) - (E) -

**Correct Answer: D**

In the standard coordinate plane, what is the y-coordinate of the point of intersection of the two lines y = 4x – 6 and y = 2x + 2?

(A)4 (B)6 (C)10 (D)18 (E)30

**Correct Answer: C**

### More ACT Math Exam Questions

- 1Which of the following expressions represents the product xy, if x = 4a
^{3}and y = -3a^{5}+ b? - 2A rope 55 feet long is cut into two pieces. If one piece is 23 feet longer than the other, what is the length, in feet, of the shorter piece?
- 3The ratio of boys to girls in a math class is 4 to 5. If there are 18 students in the class, how many are boys
- 4For what value of a is the equation 3(a + 5) - a = 23 true?
- 5In the standard (x, y) coordinate plane, what is the slope of the line with equation 4y - 6x = 8?