Mathematics Challenge for Grade 9

Identify the rational numbers from the following: 3/4, √2, -5, π, 0.75.

• √3

• 3/4, -5, 0.75

• -3.5

• 1/2

Perform the operation: (2x^2 + 3x - 5) + (4x^2 - 2x + 7).

• 5x^2 + x - 3

• 6x^2 + x + 2

• 6x^2 - x + 1

• 4x^2 + 5x + 2

Multiply the polynomials: (x + 2)(x - 3).

• x^2 - x - 6

• x^2 + x + 6

• x^2 + 5x - 6

• x^2 - 5

Solve the linear equation: 3x + 5 = 20.

• 5

• 0

• 10

• 15

If 2x - 3 = 7, what is the value of x?

• 4

• 3

• 5

• 6

Find the value of x in the equation: 5x - 2 = 3x + 6.

• 5

• 3

• 2

• 4

What is the sum of the angles in a triangle?

• 180 degrees

• 90 degrees

• 360 degrees

• 45 degrees

If two angles are complementary, and one angle measures 30 degrees, what is the measure of the other angle?

• 90 degrees

• 45 degrees

• 60 degrees

• 30 degrees

Calculate the measure of angle A if angle B is 45 degrees and they are supplementary.

• 60 degrees

• 150 degrees

• 135 degrees

• 90 degrees

In a triangle, if the lengths of two sides are 5 cm and 12 cm, what is the range of possible lengths for the third side?

• (3, 8)

• (12, 15)

• (5, 20)

• (7, 17)