91 is a unit and has a value of 91 if you just leave it as a number
The Z-value for a one-sided 91% confidence interval is 1.34
Unless you have a value of n, it would just be the expression: n + 91.
% decrease = |original value - new value|/original value * 100% = |81 - 91|/81 * 100% = 10/81 * 100% = 0.1234 * 100% = 12.34%
$2K and up
.25
It is an equation and the value of x is 91
100-1500 or more depending on specifics
€450 NEW IN IRELAND ANYWAY.
That depends on the condition of it, the cover, the pages inside, etc.
50-200 or so
Less than 1.50$.
Less than 30 cents.