Algebra Sol Review

Multiply using the FOIL method.

(x + 5)(x + 4)

• x^2 + x + 20

• x^2 + 20x + 9

• x^2 + 9x + 20

• x^2 - 9x + 54

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

Find the best fitting quadratic model for the data given. (Click on the chart to enlarge it.)

• y = 1.2x² + 13x + 504.3

• y = 12x² + 13x + 504.3

• y = .12x² + 1.3x + 504.3

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

What would the equation be that best fits this data?:
{(-15, 53.5), (-14, 28), (-3, 18), (0, 4), (6, 27), (14, 50)}

• y = .17x²+.45x+12.43

• y = .16x²+.45x+12.42

• y = -.04x + 30

• y = -.03x + 30

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 chart to enlarge it.)

• f(x)= 5x+1.82

• cannot be determined

• f(x)= 1.82x + 5.02

• f(x)= 1.1x + 4.2

Based on this pattern, would a Linear or Quadratic model be most appropriate?

• Quadratic

• Linear

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