2. Mr. Williamson wants to buy pizzas for the baseball club.
• Each pizza has 9 slices.
• There are 160 players and 20 adults in the club. n
• Each person will be given 3 slices.
How many pizzas should Mr. Williamson buy?
(A) 30 pizzas
(C) 20 pizzas
(B) 60 pizzas
(D) 10 pizzas

How do you do the foil method with polynomials?

Aprisoner is trapped in a cell containing three doors. the first door leads to a tunnel that returns him to his cell after two days of travel. the second leads to a tunnel that returns him to his cell after three days of travel. the third door leads immediately to freedom. (a) assuming that the prisoner will always select doors 1, 2 and 3 with probabili- ties 0.5,0.3,0.2 (respectively), what is the expected number of days until he reaches freedom? (b) assuming that the prisoner is always equally likely to choose among those doors that he has not used, what is the expected number of days until he reaches freedom? (in this version, if the prisoner initially tries door 1, for example, then when he returns to the cell, he will now select only from doors 2 and 3.) (c) for parts (a) and (b), find the variance of the number of days until the prisoner reaches freedom. hint for part (b): define ni to be the number of additional days the prisoner spends after initially choosing door i and returning to his cell.

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?