1. The following data represents the distance an object falls after being thrown downward from a very high height. I propose that the equation $d(t) = 5 + 4t + 5t^2$ models this data well. Determine which parts of the equation are incorrect, and fix them.

1. The following table represents data for total cost per item produced for Company A and Company B. One of them represents a linear model, the other a quadratic -- identify which is which, and explain how you determined the result.

More practice with quadratics and applications

Is it a quadratic? Or linear?

1. Solve the following equations for x:
   1. $x^2 - 5x - 14 = 0$
   2. $2x^2 + 6x = 4$
2. Match the graphs on the board to the following equations (write down the equation and sketch the graph next to the matching equation). Justify your answer.
   1. $y = -3x^2 + 18x - 24$
   2. $y = x^2 - x ...