5. The local soccer team won the championship a several years ago, and since then, ticket prices have been increasing $20 per year. The year they won the championship, tickets were $50. Write a recursive formula for a sequence that will model ticket prices. Is the sequence arithmetic or geometric?

Question

8. A radioactive substance decreases in the amount of grams by one third each year. If the starting amount of the substance in a rock is 1,452 g, write a recursive formula for a sequence that models the amount of the substance left after the end of each year. Is the sequence arithmetic or geometric?

Answer 1

#5:
T1 = 50
Tn+1 = Tn+20

#6:
T1 = 1452
Tn+1 = Tn * 2/3

I expect you can tell an AP from a GP