Answer:
88
Step-by-step explanation:
i used 1980 and 1985. I subtracted 42.1 by 33.4, got 8.7, divided that by 5 since theres been 5 years since, then multiplied by 6 since theres a 6 year difference from 2005 and 2011, then added them.
See below. The series converges.
1/4 of a pie
2 / 8 = 1/4