8th Winter Exam Practice #1

Front

Unit Conversion: How do you convert miles per hour to feet per second?

Back

To convert miles per hour (mph) to feet per second (ft/sec), multiply the speed in mph by 1.46667. For example, 62 mph is approximately 90.9 ft/sec.

Front

Simplify the Expression: 2r - 2(7r + 8) + -4

Back

The simplified expression is -12r - 20.

Front

What is the formula for finding the slope of a line?

Back

The slope (m) is calculated as m = (y2 - y1) / (x2 - x1).

Front

Evaluate the expression: b^2 + 4 when b = -3

Back

When b = -3, the expression evaluates to 13.

Front

How do you calculate percent decrease?

Back

Percent decrease is calculated using the formula: ((original price - sale price) / original price) * 100. For example, the percent decrease from $65.50 to $52.40 is 20%.

Front

What is the definition of a variable in algebra?

Back

A variable is a symbol (often a letter) that represents a number in mathematical expressions or equations.

Front

What does it mean to simplify an expression?

Back

To simplify an expression means to combine like terms and reduce it to its simplest form.

Front

What is the difference between a rational and an irrational number?

Back

A rational number can be expressed as a fraction of two integers, while an irrational number cannot be expressed as a simple fraction.

Front

What is the Pythagorean theorem?

Back

The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b): a^2 + b^2 = c^2.

Front

How do you find the area of a rectangle?

Back

The area of a rectangle is found by multiplying its length by its width: Area = length × width.