Question

Gail needs to earn a B in her Geology class. Her current test scores are 89, 78, 77, and 85. Her final exam is worth 3 test scores. In order to earn a B, Gail's average must lie between 80 and 89 inclusive. What range of scores can Gail receive on the final exam to earn a B in the course? I don't know how to do inclusive compound inequalities, can someone walk me through the process?

Answer 1

I need someone to reply quick, Please! I didn't have time to study and I don't want to get a bad grade. This is the last question can someone please help me.

Answer 2

consider her final exam as 3x or x+x+x
solve:
80 ≤ (89+78+77+85+x+x+x)/7 ≤ 89


(If you did not take the time to study, you must accept the consequences for that. You will not get any sympathy from me)

Answer 3

Thanks for the reply, Reiny! I think I know what to do, but If I don't understand then I'll ask. I wasn't asking for sympathy. I didn't have time because I just gave birth to twins and still have assignments to do.