I think they will meet in 4 minutes.
Explanation
10+15+15+15+15=70
150-20-20-20-20=70
Every minute the first balloon goes up 15 meters and the second balloon goes down 20 meters.
Answer:
the value of her medium shirts is $60 if Ella makes 100 more shirts her new value is $600
9(3b-2) Iv factorised it but I dont know the rest sorry