3 × (8 + 2) = 3 × 10 = 30

A bag contains 20 red marbles and 15 blue marbles. What is the probability of drawing a blue marble from the bag? Probability of drawing a blue marble = Number of blue marbles / Total number of marbles = 15 / (20 + 15) = 15/35 = 3/7

3/4(x + 2) = 9 Multiply both sides by 4/3: x + 2 = 12/3 Simplify: x + 2 = 4 Subtract 2 from both sides: x = 4 – 2 = 2

Simplify: 5 + 3 × (6 – 2) = 5 + 3 × 4 = 5 + 12 = 17

4x + 7 = 31 Subtract 7 from both sides: 4x = 24 Divide both sides by 4: x = 6

Solve the equation: 3/4x = 12 Multiply both sides by 4/3: x = 16

Calculate the area of a triangle with base 10 cm and height 8 cm. Area = (1/2) × base × height = (1/2) × 10 cm × 8 cm = 40 cm²

Solve the equation: 2x + 5 = 19 Subtract 5 from both sides: 2x = 14 Divide both sides by 2: x = 7

Calculate the perimeter of a rectangle with length 12 cm and width 7 cm. Perimeter = 2 × (length + width) = 2 × (12 cm + 7 cm) = 2 × 19 cm = 38 cm

If a cube has an edge length of 5 cm, what is its volume? Volume = edge length³ = 5 cm × 5 cm × 5 cm = 125 cm³

5 + 2 × (6 – 3) = 5 + 2 × 3 = 5 + 6 = 11

Simplified fraction: 12/15 = 4/5 (divide both numerator and denominator by their greatest common divisor, which is 3)

Area = length × width = 8 cm × 5 cm = 40 cm²

Probability of drawing a red marble = Number of red marbles / Total number of marbles = 15 / (15 + 10) = 15/25 = 3/5

Total slices of pizza = 8 Remaining slices = (1 – 3/4) × 8 = (1/4) × 8 = 2 Therefore, there are 2 slices left.

Solve the equation: 3(x + 5) = 42 Distribute the 3: 3x + 15 = 42 Subtract 15 from both sides: 3x = 27 Divide both sides by 3: x = 9

Simplify: 2/3 + 1/4 = 8/12 + 3/12 = 11/12

2/5 x = 10 Multiply both sides by 5/2: x = 25

Perimeter = 4 × side length = 4 × 6 cm = 24 cm

Evaluate: 4² + 3 × 2 – 5 = 16 + 6 – 5 = 17