A circle in the standard (x, y) coordinate plane is tangent to the x-axis at -a, and tangent to the y-axis at a, with a > 0. The radius of the circle is 4 units. What is the equation of the circle?
(A)x2 + y2 = 4
(B) x2 + y2 = 16
(C) (x - 4)2 + (y - 4)2 = 4
(D) (x + 4)2 + (y + 4)2 = 16
(E) (x + 4)2 + (y - 4)2 = 16
What is the solution set for the equation |-x| = x?
（A）All real numbers （B） x ≥ 0 （C） x ≤ 0 （D） Only x = 0 （E） Only x = -1
Correct Answer: B
If G is in the interior of right angle 
DEF, then which of the following could be the measure of GEF?
(A) 85° (B) 95° (C) 105° (D) 115° (E) 125°
Correct Answer: A
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
More ACT Math Exam Questions
- 1
In the figure below, rectangle ABCD shares
with 
CDE, diagonal 
of the rectangle extends in a straight line beyond D to E to create 
, and the measure of 
CDE is 155°. What is the measure of CBD?
- 2
A ramp rises 6 inches for each 24 inches of horizontal run. This ramp rises how many inches for 62 inches of horizontal run?
- 3
In the figure below, M is on
and Q is on 
The measurements are given in feet. Both NPQM and MQRL are trapezoids. The area, A, of a trapezoid is given by A = 
h(b1 + b2), where h is the height and b1 and b2 are the lengths of the 2 parallel sides.9.
What is the area of MQRL, in square feet?
- 4
Which of the following could be the graph of the equation y= 175x2– 33x– 2,000?
- 5Is the ACT or SAT more difficult?