Mastering Math Skills for Grade 8

Solve for x: 3x + 5 = 20.

• 0

• 15

• 5

• 10

If y is directly proportional to x and y = 12 when x = 4, what is y when x = 10?

• 24

• 30

• 15

• 40

What is the slope of the function f(x) = 2x + 3?

• 2

• -2

• 3

• 1

Calculate the area of a rectangle with length 8 cm and width 5 cm.

• 50 cm²

• 30 cm²

• 20 cm²

• 40 cm²

What is the perimeter of a triangle with sides measuring 3 cm, 4 cm, and 5 cm?

• 8 cm

• 12 cm

• 10 cm

• 15 cm

Interpret the following data: If a graph shows a line increasing from (1,2) to (3,6), what is the rate of change?

• 3

• 1

• 4

• 2

If f(x) = x^2 - 4, what is f(3)?

• 7

• 5

• 1

• 9

A circle has a radius of 7 cm. What is its area?

• 154 cm²

• 160 cm²

• 150 cm²

• 153.94 cm²