On thursday you ran to a playground 2 1/4 mi. from your house. it took you 19 min. to run there and 20 minutes to run back home. on friday you ran the entire4 1/2 mile at a constant speed of 6 1/4 mi/h. how many minute did it take you to run on thursday?

Hi, can anyone show me how to do this problem? 100 points for this. in advance

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.

Drag each equation to the correct location on the table. for each equation, determine the number of solutions and place on the appropriate field in the table.