7th grade PE 2 Review Units 1-4

Front

What is the constant of proportionality?

Back

The constant of proportionality is the ratio between two proportional quantities, often represented as 'k' in the equation y = kx.

Front

How do you calculate sales tax?

Back

Sales tax is calculated by multiplying the price of an item by the sales tax rate (as a decimal). For example, if an item costs $3.75 and the tax rate is 12%, the tax is $3.75 * 0.12 = $0.45.

Front

What is a markup?

Back

A markup is the amount added to the cost price of goods to cover overhead and profit. It is often expressed as a percentage of the cost price.

Front

How do you find the selling price with a markup?

Back

To find the selling price, add the markup amount to the cost price. For example, if the cost is $70 and the markup is 40%, the selling price is $70 + ($70 * 0.40) = $98.

Front

What is the formula for the circumference of a circle?

Back

The circumference (C) of a circle is calculated using the formula C = 2πr, where r is the radius.

Front

How do you calculate the distance covered by a wheel after multiple rotations?

Back

To find the distance covered, multiply the circumference of the wheel by the number of rotations. For example, if the radius is 13 inches, the circumference is 2 * π * 13 = 81.64 inches. For 6 rotations, the distance is 81.64 * 6 = 489.84 inches.

Front

What is 20% of a number?

Back

To find 20% of a number, multiply the number by 0.20. For example, 20% of 30 is 30 * 0.20 = 6.

Front

What does it mean for a table to be proportional?

Back

A table is proportional if the ratio of the values in one column to the values in another column remains constant.

Front

How do you convert a percentage to a decimal?

Back

To convert a percentage to a decimal, divide the percentage by 100. For example, 12% as a decimal is 12 ÷ 100 = 0.12.

Front

What is the relationship between cost price, selling price, and profit?

Back

Profit is the difference between the selling price and the cost price. If selling price > cost price, profit is positive.