Algebra A.9

Using the curve of best fit, what would be the output (y) when the input (x) is 7? (Click the graph to enlarge it.)

• 260

• 240

• 140

• 320

Calculate the Curve of Best Fit for this table of values:

• y = 2x² - 9x + 10

• y = 3x² + 9x - 10

• y = 3.1x² - 9.2x - 10.3

• y = 2.1x² - 8.6x + 10.1

The table shows the average braking distance of a car at various speeds.  Use a quadratic model to predict the breaking distance at 70mph.  (Click on the chart to enlarge it.)

• 245 ft

• 225 ft

• 285 ft

• 265 ft

In the equation y = x² +5x +7, match each coefficient with its correct letter

• a=0, b=5, c=7

• a=1, b=5, c=7

• a=7, b=5, c=1

What is the line of best fit? (Click on the graph to enlarge it.)

• y = 5/3x + 375

• y = 1/3x + 475

• y = 5/3x + 3

• y = 1/3x + 375

What is the line of best fit? (Click on the chart to enlarge it.)

• f(x)= 5x+1.82

• cannot be determined

• f(x)= 1.82x + 5.02

• f(x)= 1.1x + 4.2

The table shows the height of a tree for various years after it was planted. Using the line of best fit, how tall would the tree be 30 years after it was planted? (Click on the chart to enlarge it.)

• 22 feet

• 23 feet

• 36 feet

• 37 feet

The table shows the height and shoe sizes of several students. Use the line of best fit to predict a student's height if they wear a size 7 shoe. (Click on the chart to enlarge it.)

• 35 inches

• 59 inches

• 17 inches

• 63 inches

Find the line of best fit through these points (0,0) (1,2) (3,5) (6,7).

• y=65x+7

• y=1.14x+.64

• y=1.5x+64

If this is an equation for a curve of best fit, find the output (y) when the input (x) is 13:

y = 1.2x² - 3.7x - 19

• -51.5

• 135.7

• 154.7

• 183.8