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.
B = 73°, c = 107°, d= 107°