Oliver needs an average of at least an 75 on his three geometry exams. He scored an 85 on his 1st exam and a 55 on his 2nd exam. What is the minimum
grade Oliver needs on his 3rd exam?

Situation: find the age of the skull to the nearest year, enter the correct answer. a hiker in africa discovers a skull that contains 32% of its original amount of c- 14. done n = noekt 00000 no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years