REVISION PURE MATHS 1

b²-4ac is called

• completed squared form

• discrimininant

• root

• quadratic equation

Solve the following linear inequality.

5x-3 ≤ 2x-15

• x ≤ -4

• x ≥ -4

• -4 ≤ x ≤ -4

• x ≥ 4

Find the set of values of k for which x² + kx + 4 = 0 has 2 roots.

• k ≥ 16

• k ≥ 4

• -4 ≤ k ≤ 4

• k ≥ 4 or k ≤ -4

• 6.08 cm

• 3.23 cm

• 16.4 cm

• 3.15 cm

Find the volume of the solid of revolution obtained by rotating the region in bounded by y = x³ + 1, x = 1 and y = 1 about the y-axis.

• 2π/3

• π

• 3π/5

• 2π/5

If the region enclosed by the y-axis, y = 2 and the curve y = √x is revolved about the y-axis, what is the volume of the solid generated?

• 32π/5
• 16π/3
• 16π/5
• 8π/3

In circle O, the radius is 4, and the measure of minor arc AB is 120 degrees. Find the length of minor arc AB to the nearest integer.

• 5
• 9
• 8
• 6

Tags

CCSS.HSG.C.B.5

CCSS.HSG.GMD.A.1

Find the arc length.  Leave your answer in terms of π.

• 7/4π
• 7/2π
• 1/8π
• 45π

What is 3π/4 radians in degrees?

• 315
• 135
• 150
• 330

What is 150 degrees in radians?

• 5π/6
• 7π/6
• 5π/4
• π/6