Flashback x, y, z and f are all positive integers. x is bigger than y, and z is smaller than y. Which of the following must be true? Anx = y + z Bx + n is larger than z + n Cny is the average of x and z Dy + n is smaller than x + z Ex + y = 2n – z

Joke of the day Where did Christopher Complementary begin his journey?

At the Verta Seas.

A few definitions Mathematical model- way to approximate data so that future data can be predicted. Numerical Model- Uses raw data and analyzes it to look for trends. Algebraic Model- Uses formulas to approximate data and to predict future values. Graphical Model- Visible representation of numerical and algebraic models.

The Minimum Hourly Wage YearMinimum Hourly WagePurchasing Power in ‘96 Dollars

US Prison Population YearTotalMaleFemale

Female percentage of US Prison Population Year% Female

Algebraic model Which is a better deal if pizzas are the same price: rectangular 18” x 24” or round 24”? Model: Area! A= l x w and A=∏r^2

Fitting a Curve to data PercentageOf FemalesIn thePrisonPopulationIn years after 1980 T f Use linreg on calculator to find line that fits data.

HW: p. 81 Ex. 1-10

Exit Slip p. 82 #11, 13, 15, 19, 21, 23