SECOND QUARTER REVIEWER IN GRADE 9 MATHEMATICS

What type of variation is being illustrated in the following equations? U = k/m

• combined

• direct

• inverse

• joint

What type of variation is being illustrated in the following equations? t = kwz

• combined

• direct

• inverse

• joint

What type of variation is being illustrated in the following equations? P = kwd/l

• combined

• direct

• inverse

• joint

The length (L) of the pendulum is directly proportional to the square of the time (t) it takes to swing from one side to the other. Which of the following mathematical statements best describe the situation?

• L = k/√t

• L = k/t²

• L = k√t

• L = kt²

What is the variation statement of the given situation “The pressure P of a gas varies directly as its temperature t and inversely as its volume V”?

• P = ktV

• P = ktV²

• P = kt/V

• P = kV/t

What statement describes the relationship y = ka/b?

• y varies directly as a and b

• y varies inversely as a and b

• y varies jointly as a and b

• y varies directly as a and inversely as b

What is the mathematical equation that best described the table at the right side?

• y = -24x

• y = 24x

• y = 24/x

• y = -24/x

If a varies directly as b, and a = 12 when b = 3. What is the equation of variation?

• a = 2b

• a = 3b

• a = 4b

• a = 5b

What is the value of k when y varies inversely as x and y = 6 when x = 24?

• 4

• 12

• 18

• 144

A mailman can sort out 738 letters in 6 hours. If the number of sorted letters varies directly as the number of working hours, how many letters can be sorted out in 9 hours?

• 123

• 738

• 1107

• 6642