5/12 practice 1

What kind of correlation?

• Positive
• Negative
• No

What kind of correlation?

• Positive
• Negative
• No

The high divers at Canada’s Wonderland perform competitive dives from a height of 21m. A diver’s data is shown. Based on the R² value, find the equation of best fit. Then predict the height of the diver after 2 seconds.

Round to the nearest hundredth for all values.

The data in the table shows the average United States farm size. Find the line of best fit and predict the average farm size in the year 2014.

• 14 acres

• 466 acres

• 3461 acres

• 463 acres

 Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x
• y=100x
• y=5.25x
• y=4/21x

Is the given table a direct variation? If so, what is the constant of variation?

• Yes; 1/3
• Yes; 3
• Yes; 5
• No

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct, 12
• Inverse, 12
• Direct, 1/12
• Inverse, 1/12

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4
• Yes; 4
• Yes; 2
• No

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

• 14
• 10
• 2
• -14

The equation 
xy =  25  represents:

• direct variation
• inverse variation
• joint variation
• none of these