If a ≠ b and 1/x + 1/a = 1/b, then x =
A. 1/b - 1/a
B. b - a
C. 1/ab
D. a - b/ab
E. ab/a - b - ✔️ E
The graph of which of the following equations is a straight line parallel to
the graph of y = 2x ?
A. 4x - y = 4
B. 2x - 2y = 2
C. 2x - y = 4
D. 2x + y = 2
E. x - 2y = 4 - ✔️ C
An equation of the line that contains the origin and the point (1, 2) is
A. y = 2x
B. 2y = x
C. y = x -1
D. y = 2x +1
E. y/2 = x - 1 - ✔️ A
An apartment building contains 12 units consisting of one- and two-
bedroom apartments that rent for $360 and $450 per month, respectively.
When all units are rented, the total monthly rental is $4,950. What is the
number of two-bedroom apartments?
A. 3
B. 4
C. 5
D. 6
E. 7 - ✔️ E
If θ is an acute angle and sin θ = 1/2, then cos θ =
A. -1
B. 0
C. 1/2