PACKS
p. 17 : Adept of all trades includes a rating 4 Improved Ability. This power can only improves the skill rating up to 50%, so a rating 4 implies a rating 8 skill.
p. 17, Convincer also includes a rating 4 Improved Ability power.
Anatomy of a Shadowrun
p. 4, "Riser rolls Negotiation 6 (Bargaining +2) + Charisma 7 with a +10 modifier" : actually, the modifier is capped to +7 (Riser's Charisma), for a total dice pool of 22.
Edit: was wrong on Riser's test indeed.