MATHEMATICS 8

If the mean of 4 numbers is 6, what is their total sum?

• 24

• 6

• 4

• 12

Multiply: 3x (x² + 2x + 1)

• 3x³ + 6x² + 3x

• 3x² + 2x + 1

• 3x³ + 2x² + x

• x³ + 6x² + 3x

Multiply: (x - 4) (x + 4)

• x² - 16

• x² + 8x + 16

• x² - 8x + 16

• x² + 4x - 4

Simplify: 5x2/10x

• x2

• 12x

• 2x

• x10

If the median of the data set {7, 5, 3, 9, x} is 7, what is the value of x?

• 1

• 11

• 7

• 5

A student scored 70, 75, and 80 on three quizzes. What score does he need on the fourth quiz to have a mean of 80?

• 85

• 90

• 95

• 100

What is the median of: 7, 3, 9?

• 3

• 7

• 5

• 9

What is the product: (x + 2) (x - 3)?

• x² - x - 6

• x² + x - 6

• x² - 6x + 2

• x² - 1

Factor: x² - 2x - 15

• (x + 3) (x - 5)

• (x - 3) (x - 5)

• (x - 3) (x + 5)

• (x + 5) (x + 3)

Multiply: (2x + 1) (x - 4)

• 2x² - 7x - 4

• 2x² - 7x - 4

• 2x² - 8x + x - 4 = 2x² - 7x - 4

• All of the above