David must install fencing around a lot that is shaped like a right triangle. The side of the that runs east to west is 20 feet long. The side
of the lot that runs north to south is 12.5 feet long. Calculate how many
feet of fencing is needed for the side that runs from the northwest to
the southeast side.
round to nearest tenth

Aye asap pls ! markin da brainiest too ! btw da step choices are all add, distribute, divide, n subtract

What is the rate for one gallon of gasoline

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.