Mid-term review

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is used to determine the size of a scale drawing compared to the original object.

Front

If the original size is 12 units and the scale factor is 1/4, what is the size of the scale drawing?

Back

3 units.

Front

What is the formula to solve for x in the equation 12 = 5x + 17?

Back

Rearranging gives x = (12 - 17) / 5 = -1.

Front

How do you calculate percent increase?

Back

Percent increase = (New Value - Original Value) / Original Value x 100%.

Front

If Tom's math grade increased from 80 to 90, what is the percent increase?

Back

12.5%.

Front

What is a perfect square?

Back

A perfect square is an integer that is the square of another integer.

Front

Which of the following is NOT a perfect square: 196, 169, 121, 132?

Back

132.

Front

How do you calculate percent decrease?

Back

Percent decrease = (Original Value - New Value) / Original Value x 100%.

Front

If Mrs. Banks bought a car for $25,000 and sold it for $16,000, what is the percent decrease?

Back

36%.

Front

What is the definition of a variable in algebra?

Back

A variable is a symbol used to represent an unknown value in mathematical expressions or equations.