Line and Curve of Best Fit Review

When using Desmos to find the curve of best fit, what do I need to enter first?

• y₁ ~ ax₁² +bx₁ + c

• the equation

• the table/chart of values

• the vertex

Calculate the quadratic regression function for this table of values to the nearest tenth.

• f(x) =
   2x² - 9x + 10

• f(x)=
   3x² + 9x - 10

• f(x) =
   3.1x² - 9.2x - 10.3

• f(x) =
  2.1x² - 8.6x + 10.1

Given the graph, what would be in the output (7) when the input (x) is 6?

• 1125

• 850

• 700

• 600

Given the following scatter plot, which equation best models the data? (Hint: in this specific case, you don't really need Desmos)

• y = -8.25x + 56

• y = -8.25x² + 56x

• y = 8.25x² + 56x

• y = -8.25x³ + 56x

Match the table with the correct equation:

• y = -.08x² + 5.94x +28.80

• y = -1.2x² + 3.2x +3.2

• y = 0.5x +9

• y = 0.7 x² + 2.7x +8.7

Match the table with the correct equation:

• y = -.08x² + 5.94x +28.80

• y = -1.2x² + 3.2x +3.2

• y = 0.5x +9

• y = 0.7 x² + 2.7x +8.7

Using the Curve of Best fit for #11. Predict the value of y when x = 3.

• 5

• 7

• 9

• 11

What is the equation of the line of best fit

• y= -2x + 10

• y= 10x+ 2

• y=2x+10

• y= 10

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55

• 0

• 103

• 100