Finding a Quadratic Model

Find the best fitting quadratic model for the data given.

• 1.2x² + 13x + 504.3
• 12x² + 13x + 504.3
• .12x² + 1.3x + 504.3

Estimate the height of the ball when it traveled a distance of 10 feet.

• 12.8 ft

• 13.3 ft

• 11.1 ft

• 17 ft

Estimate the population for 1975.

• 623 thousand people

• 650 thousand people

• 599 thousand people

• 513 thousand people

Find the best fitting Quadratic model for the data

• -.26x^2-17.3x+222.8
• -.26x²+22.59x+23.02
• 2.6x²+22.9x+20.03
• 2.6x²+2.3x+23.02

Estimate the distance if the angle is 45 degrees.

• 510 ft

• 507 ft

• 520 ft

• 505 ft

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

The Ti-84 will do this if you press the STAT button choose option 1. EDIT then insert the table values. Finally press STAT, →, and select option 5. QuadReg

• True

• False

What is the shape of a quadratic graph?

• Parabola
• Line
• Square