Part B
Using squares 1, 2, and 3, and elght copies of the original triangle, you can create squares 4 and 5 C. Keep the square 4 and
square 5 window open. You will need them to complete the rest of the tasks in this section.
What are the side lengths of square 4 and square 5 in terms of a and b? Do the two squares have the same area?

Which equation represents the partial sum of the geometric series?

How many grams the dog will eat in 3 days?

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.