Grade 8 DOKI and DOKII MCA Samplers

Mild

• A 160-pound male lifter will lift between 950 and 1,000 pounds.

• A male lifter who lifts 925 pounds will weigh between 200 and 240 pounds.

• There will be 0 male lifters who lift more than 950 pounds.

• There will be 0 male lifters who weigh less than 120 pounds.

Answer explanation

Find 925 on the y-axis (weight).

Find the dot it will match with to find x (lift)

Mild

Medium

• Over time, fewer computers were sold.

• One store sold fewer computers each year than in the previous year.

• More computers were sold in year 1 than in year 4.

• The number of computers sold over time did not change consistently.

Answer explanation

The scatterplot's correlation is in a horizontal line (no positive and no negative trends).

So, that tells us that the relationship is not changing and it consistent.

Medium

• $10

• $15

• $19

• $24

Answer explanation

Draw a line of best fit.

Shows a positive trend.

Go to x = 5. Go up until you reach the line of best fit.

Medium

• 3

• 4

• 5

• 6

Answer explanation

Follow the pattern in the coordinates on the line:

(3, 14)

(4, 12)

(5, 10)

(6, 8)

(7, 6)

(8, 4)

Or write an equation for the line of best fit: y = -2x + 20

Plug in x = 8

Spicy

• (1, 0)

• (1, 4)

• (2, 6)

• (8, 3)

Answer explanation

(1, 4), (2, 6), and (8, 3) are points that are higher on the graph. This would make the line less steep.

(1, 0) is lower on the graph forcing the line to be more steep.

Which equation has a graph that is parallel to the graph of y=4x−3?

• y = -4x + 3

• y = -1/4x - 3

• y = 1/4x - 3

• y = 4x + 3

Answer explanation

Parallel = Same Slope

Which equations represent parallel lines?

• 
• 
• 
• 

Answer explanation

Parallel lines = same slope

What is the distance between points (12,  4 ) and (12,  9 )?

• 5 units

• -5 units

• 13 units

• -13 units

Answer explanation

Label your coordinates.

Plug into formula.

Follow GEMDAS

Which side lengths form a right triangle?

• 2, 4, 8

• 4, 5, 6

• 5, 12, 13

• 9, 16, 25

Answer explanation

Hypotenuse (c) is the longest side.

Plug in a and b into the formula.

Square root.

Should equal to the third side length.