During a school fund raiser, the fifth-grade classes sold rolls of wrapping paper.
The table shows how many rolls each class sold. The rolls were sold in packages
of 4.
Wrapping Paper Sold
Class
Total Rolls
Ms. Lane
672
Mr. Milner
184
Mrs. Jackson
228
How many packages of wrapping paper did Ms. Lane's class sell?
A. 2.688
B. 173
C. O 168
D. 143

How many terms does the polynomial x^2 y^2 have

Ihave a triangle with a 60 degree angle. lets use d for that angle. what are the values of e and f if d is 60 degrees? and what do you notice about the values of e and f?

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.