You would have to go to the manufacturers support site and look for W8.1 devices or drivers.
It's just too new of an operating system to make a list.
Your Model 81 was halted in the year 2003.I would surmise that Marlin had a new model in the works at the time of the model 81 demise.
Without an equality sign the given terms can't be considered to be an equation but if you mean 3d = -81 then the value of d works out as -27 by eliminating the 3 and dividing it into -81
4904.6 / 60 = 81.7433 recurring, which works out as: 81 minutes 44.6 seconds.
81% of 81= 81% * 81= 0.81 * 81= 65.61
81
The Sten 1/2 x 80 or 81" works well .
It is 81*81*81. Which is 531,441.
The answer is 1,3,9,27,81. 81*1=81 3*27=81 9*9=81 27*3=81 81*1=81
81
"What is divisible by 81?" Any multiple of 81 is divisible by 81. For example, all of the following are divisible by 81: 81 = 1 x 81 162 = 2 x 81 243 = 3 x 81 324 = 4 x 81 and so on. ========================================= Did you mean to ask "What is 81 divisible by?" 81 is divisible by 1, 3, 9, 27, 81.
81
9² = 9 × 9 = 81