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 directly proportional quantities, often represented as 'k' in the equation y = kx.

Front

How can you determine if y is directly proportional to x?

Back

You can determine if y is directly proportional to x by checking if the ratio y/x is constant for all pairs of values.

Front

If Karen has $350 and spends $25, how much money does she have left?

Back

Karen has $325 left.

Front

What percent of Karen's original money does she have left after spending $25?

Back

92.8% of her original money.

Front

If you were assigned 30 problems and completed 20% of them, how many problems did you complete?

Back

You completed 6 problems.

Front

What is the formula to find the area of a semicircle?

Back

The area of a semicircle is given by the formula A = (1/2)πr², where r is the radius.

Front

What is the radius of a semicircle if its diameter is 30 inches?

Back

The radius is 15 inches.

Front

Define direct proportionality in mathematical terms.

Back

Direct proportionality means that as one quantity increases, the other quantity increases at a constant rate.

Front

What is the relationship between the constant of proportionality and a linear equation?

Back

In a linear equation of the form y = kx, 'k' represents the constant of proportionality.

Front

How do you calculate the percentage of a number?

Back

To calculate the percentage of a number, divide the part by the whole and multiply by 100.