ACT Math Practice

What is the formula for the circumference of a circle?

• C = πd, where C is the circumference and d is the diameter.

• C = 2πr, where C is the circumference and r is the radius.

• C = πr^2, where C is the area and r is the radius.

• C = 2r, where C is the circumference and r is the radius.

What does a line with a slope of 0 look like?

• A vertical line.

• A diagonal line sloping upwards.

• A horizontal line.

• A diagonal line sloping downwards.

What is the formula for the area of a circle?

• A = πr², where A is the area and r is the radius.

• A = 2πr, where A is the area and r is the radius.

• A = πd², where A is the area and d is the diameter.

• A = r², where A is the area and r is the radius.

What is the formula for the volume of a cylinder?

• V = 2πr²h

• V = πr²h

• V = πr² + h

• V = 4/3πr³

What is the formula for the sum of the interior angles of a polygon?

• Sum = (n - 2) * 180°

• Sum = n * 180°

• Sum = (n + 2) * 90°

• Sum = (n - 1) * 180°

What is the quadratic formula?

• x = (-b ± √(b² - 4ac)) / (2a) for the equation ax² + bx + c = 0.

• x = (b ± √(b² + 4ac)) / (2a) for the equation ax² + bx + c = 0.

• x = (-b ± √(b² + 4ac)) / (2a) for the equation ax² + bx + c = 0.

• x = (b ± √(b² - 4ac)) / (2a) for the equation ax² + bx + c = 0.

What is the solution to the equation x² - x = 72?

• x = 7

• x = 8

• x = 9

• x = 10

What is the definition of a function?

• A relation where each input has exactly one output.

• A set of ordered pairs with no restrictions.

• A collection of inputs and outputs that can be random.

• A mathematical expression that can be simplified.

If 15 passengers share the cost of a bus rental and 7 have not paid, with $177.60 collected, what is the total cost?

• $250.00

• $300.00

• $333.00

• $400.00

Solve for x: 2x + 3 = 3x - 4.

• x = 5

• x = 6

• x = 7

• x = 8