I am new to this site and am looking for some guidance on how I can solve a word problem dealing with compound inequalities. The question is:
Ralph needs to earn a B in his Geology class. His current test scores are 91, 94, 79, and 74. His final exam is worth 6 test scores. In order to earn a B Ralph's average must lie between 80 and 89 inclusive. What range of scores can Ralph receive on the final exam to earn a B in the course?
I just need the first step...I don't know where to start.