Please help me with this question! Dinner at TGI Friday's costs $50 for your family. Find your total cost if the sales tax is 6% and you leave a 15% tip on the total bill. Round to the nearest cent if necessary. (Remember, some people tip on the cost of the meal, and some people tip on the total with tax. In this case, it is clear that we are tipping on the cost plus tax because it says "total bill." This means we need to treat it as a two-step problem.)

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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.

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =