If 
, then a=
(A) 
(B) b
(C) b2
(D) b4
(E) b8
In the figure below, side 
of isosceles triangle 
NLM lies on the line y + 
x = 2 in the standard (x,y) coordinate plane, and side 
is parallel to the x-axis. What is the slope of 
?
（A）
（B）
（C） 
（D） 
（E） 
Correct Answer: B
A department store escalator is 25 feet long and forms an angle of 43° with the floor, which is horizontal. Which of the follow is an expression for the horizontal distance of the escalator from beginning to end?
(A) 25 sin 43° (B) 25 cos 43° (C) 25 tan 43° (D) 25 csc 43° (E) 25 sec 43°
Correct Answer: B
In the standard (x,y) coordinate system, circle O has its center at (4,-3) and a radius of 12 units. Which of the following is an equation of the circle?
（A）(x - 4)2 + (y + 3)2 = 12 （B） (x + 4)2 + (y + 3)2 = 12 （C） (x + 4)2 - (y + 3)2 = 12 （D） (x - 4)2 + (y - 3)2 = 144 （E） (x - 4)2 + (y + 3)2 = 144
Correct Answer: E
More ACT Math Exam Questions
- 1The expression (3x - 5)(x + 2) is equivalent to:
- 2
The endpoints of the diameter of a circle O are A and C. In the standard (x,y) coordinate plane, A is at (4,3) and C is at (-9,-2). What is the y-coordinate of the center of the circle?
- 3If x2– x– 2 > 0, which of the following is the solution set for x?
- 4If xy = 144, x + y = 30, and x > y, what is the value of x – y ?
- 5For all
is equivalent to: