to txuser: As far as I can tell, for Bahamas one neeeds a tourist visa. For Mexico - as long as the cruise is not more than 3 days, one does not need any visa (anyone in the world does not need a Mexico visa for a cruise upto 3 days). For entering back in US, either you can enter on a stamped visa or on AP. Pls check as well.
Discriminant of a Quadratic. The number D = b2 â 4ac determined from the coefficients of the equation ax2 + bx + c = 0. The discriminant reveals what type of roots the equation has. Note: b2 â 4ac comes from the quadratic formula.
MIRR formula. where: 1  NPV() is the Excel NPV function. 2  rrate is the reinvestment rate. 3  frate is the finance rate. 4  values[positive] is the positive values in the array only. 5  values[negative] is the negative values in the array only. 6  n is the number of periods.