# Fractions MCQs - Math Test 3

MCQ. Simplify (x - 9)(x + 10) ⁄ (x^{2} - 81)

- (x
^{2}+ x - 90) ⁄ (x^{2}- 81) - (x + 10) ⁄ (x - 9)
- (x + 10) ⁄ (x + 9)
- None of above

C

MCQ. Simplify (3x ⁄ 2y)(x ⁄ 3y)

- x ⁄ 2y
- (3x
^{2}) ⁄ (2y^{2}) - x
^{2}⁄ (6y^{2}) - x
^{2}⁄ (2y^{2})

D

MCQ. Simplify (1 ⁄ (x^{2} - 1)) ÷ (1 ⁄ (x + 1))

- 1 ⁄ (x - 1)
- 1 ⁄ (x + 1)
- 1 ⁄ (x
^{2}- 1) - None of above

A

MCQ. Simplify (1 ⁄ s) - (1 ⁄ t)

- (s - t) ⁄ st
- (t - s) ⁄ st
- 0
- 1 ⁄ (s - t)

B

MCQ. Simplify (2 ⁄ tanA) + (4 ⁄ tanB)

- (2tanB + 4tanA) ⁄ tanAtanB
- (2tanA + 4tanB) ⁄ tanAtanB
- 6 ⁄ (tanA + tanB)
- None of above

A