For 9. the third table and for 10. the second table
set up the triangle with the information given. then just solve for x.
If by description you mean simplification then: 84x/28
Well if there are 3 outcomes just add the two other outcomes and subtract from 1
so 0.4+0.25=0.35
so the third outcomes has a 0.35 chance of happening or 35%