If you toss eight coins, there are 256 (28) different outcomes.
Two
3
There are 12 possible outcomes.
2*2*6 = 24 outcomes.
2x2x2=8 possible outcomes. In general for n tosses there are 2^n outcomes.
24 or 16
There are 4 possible outcomes. There are 2 outcomes (heads or tails) on the first toss and 2 on the second toss. The possibilities are HH, TT, HT and TH.
Two times the number of outcomes of the spin - which is not specified in the question.
2^4 = 16
4
Each toss has 2 outcomes; so the number of outcomes for 3 tosses is 2*2*2 = 8