A heron is perched in a tree 50 feet above sea level Directly below the heron, a pelican is flying 17 feet above sea level Directly below the birds is a trout, swimming 23 feet below sea level
Select the THREE true statements

A The difference in height between the pelican and the heron is -33 feet

B The difference in height between the pelican and the heron is 33 feet.

C. The distance between the heights of the pelican and heron is -33 feet

D The difference in height between the pelican and the trout is -40 feet

E. The difference in height between the pelican and the trout is 40 feet

F. The distance between the heights of the pelican and the trout is 40 feet
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Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?

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.