What are the correct answers to this geometry problem?

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

Kayla has a $500 budget for the school party.she paid $150 for the decorations.food will cost $5.50 per student. what inequality represents the number of students,s, that can attend the party?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c