Math7.PreAlgebra Midterm review

Front

What is the formula for the perimeter of a rectangle?

Back

The perimeter P of a rectangle is given by the formula P = 2(length + width).

Front

If the length of a rectangle is represented by the expression 2x - 7 and the width is 4, what is the variable expression for the perimeter?

Back

P = 2((2x - 7) + 4) = 4x - 6.

Front

What does the absolute value of a number represent?

Back

The absolute value of a number is its distance from zero on the number line, regardless of direction.

Front

Back

The result is -8.

Front

Back

x = -4.

Front

Back

Front

When adding or subtracting numbers with the same sign, what operation do you perform?

Back

When signs are the same, you add.

Front

What is the difference between a variable and a constant in algebra?

Back

A variable is a symbol that represents an unknown value, while a constant is a fixed value.

Front

What is the process of solving an equation?

Back

The process involves isolating the variable on one side of the equation to find its value.

Front

What does it mean to simplify an expression?

Back

To simplify an expression means to reduce it to its simplest form by combining like terms and performing operations.