Mathematics 9 Second Quarter Exam

A car rental company charges a fixed fee of $50 plus $0.25 per mile driven. This is an example of:

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

The cost of printing flyers is $100 for 500 copies and $150 for 1000 copies. This is an example of:

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

The time it takes to complete a task decreases as the number of workers increases. This is an example of:

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

The amount of money earned by a salesperson is directly proportional to the number of products sold. This is an example of:

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

The speed of a car decreases as the number of passengers increases. This is an example of:

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

"A varies jointly as b and c" means a = kbc, or k =a/bc, where k is the constant of variation. This statement is an example of what variation?

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

"y varies directly as x", "y is directly proportional to x" and "y is proportional to x" may be translated mathematically as y = kx, where k is the constant of variation. This statement is an example of what variation?

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

"z varies directly as x and inversely as y" means z =kx/y, or k =zy/x, where k is the constant of variation. This statement is an example of what variation?

• Combined variation

• Direct variation

• Inverse variation

• Joint variation

Any number, excluding zero, with an exponent of zero is equal to what number?

• 0

• 1

• 2

• 3

A reciprocal is when you "flip a fraction", what is the reciprocal of ½?

• ½

• ¾

• 1

• 2