yes it can.
1 in. x 12 in. S4S Oak boards may be purchased in 10 foot lengths. The longest length available is 12 foot. One must check with your local Home Depot store for availability.
Basically random lengths mean they could vary in length. An 8 foot board maybe a little less than 8 feet. It could be 7 foot 11 n 1/2 inches long.
yes you can do that, but your going to want to paint or seal it.
1 x 12. Actually comes in at. 3/4" x 11-1/4"
yes you could do that.
No, not treated
I bought 2 the same length and for both it was over 40 dollars
Yes although thinner than most stair treds. It can be used.
Basically linear foot means 11.99 per every foot of length. So 6 foot board would run 71.94 plus tax.