9th Grade Math Jeopardy

Standard form

100

Convert 2x+3y=24

y=-2/3x+8

200

Convert -4x+6y=24

y=2/3x+4 or y=4/6x+4

300

Convert 4.5x+9y=72

y=-1/2x+8 or y=4.5/9x+8

400

2.75x+11y=22

y=1/4x+2

500

-1.25x+10y=30

y=1/8x+3

Rate of Change

100

Find the rate of change

(2,4)(3,6)

2

200

Find the Rate of Change

(1,7)(2,14)

7

300

Find the Rate of Change

(-3,-5) (7,10)

15/10 or 3/2 or 1.5

400

Find the Rate of Change

(-4,-8) (-9,-3)

-1

500

Find the Rate of Change

(2.5,1.5)(1.75,3.15)

-2.2

Direct Variation

100

slope of parallel line

-6x-4y=-1

-3/2 or -1.5

200

slope of perpendicular line

-6x-4y=-1

2/3

300

Slope of parallel line

7x+9y=18

-7/9

400

Slope of perpendicular line

7x+9y=18

9/7

500

Slope of parallel and perpendicular

2.5x-7.5y=30

Parallel:1/3

Perpendicular:-3

Parallel and Perpendicular lines

100

5x + 7y = -9

What is the slope of a line perpendicular and parallel to this line?

Parallel:-5/7

Perpendicular:7/5

300

A plastics company makes two sizes of recycling bins in the shape of rectangular prisms. The smaller bin has a volume of 500 cubic inches. The length, width, and height dimensions of the larger bin are twice those of the smaller bin. This is the volume of the larger recycling bin?

What is 4,000 in³ ?

400

If triangle ABC has a base of 20 ft and area of 400 square feet, and if triangle DEF is similar and has a base of 10 ft, this would be the area of triangle DEF?

What is 100 ft² ?

500

The floor of a room measures 12 feet by 10 feet. The room has 9-foot cailings. The walls of the room are to be painted. This is the area to be painted.

What is 396 ft² ?

Nth term

100

A random survey of 75 eighth graders at Cedar Middle School showed that 37 of them do volunteer work. This is the approximate number of students who do volunteer work out of the 500 eighth graders at the school.

What is 247 ?

200

A school committee conducted a survey to find out whether teachers would prefer to start the school day 30 minutes later. Only teachers with children in preschool were surveyed. This is the reason why the results of this survey might NOT be a valid representation of what all the teachers at the school would prefer?

What is "The survey was not conducted using a random sample of teachers."

300

Mr. Williams bought three raffle tickets at a marching band fund-raiser. He finds out how many tickets were sold and calculates that his theoretical probability of winning is 1 in 150. This is the number of that tickets were sold?

What is 450 ?

400

At the Grand Lakes Basketball Tournament, 4 basketball games are played in 4 different gymnasiums at the same time. If all 4 games begin with a coin toss, this is the probability that all 4 coins will be heads?

What is one out of sixteen

500

During the past winter, the Bender family had monthly heating bills of $79, $146, $212, $149, and $212. This is the mean, meadian, mode, and range.

What are... Range: $133, Mode: $212 Median: $149 Mean: $159.60