what is this??? A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive.

Question

mathmale · Answer

What would the formula for "average value" in this case?  Please type it out.

dopeboydee · Answer

I don't know that's the point

sapphiremoon · Answer

We need to find a compound inequality that will give us an average between 85 and 90. Okay, good. A compound inequality  is something like 70 < x < 95. Let x be the third score. We know 85 < (x + 91 + 83)/3 < 90. Let's break that up into two. (x + 174)/3 > 85 and (x + 174)/3 = 90. Can you solve each of these inequalities for x?

mathmale · Answer

If you are 16 and I am 72 (which I am), what is the average of our ages?

dopeboydee · Answer

44

dopeboydee · Answer

thx SapphireMoon

sapphiremoon · Answer

yw, sorry I interrupted @mathmale, he was starting at a more elementary level than I was...

dopeboydee · Answer

lol im a graduate honestly I didn't need help I wanted to see if anyone else would get it but now I see that there are a lot of people who like math like I do :D

mathmale · Answer

Your time might be better spent posting NEW questions.  Glad you enjoy math.  Let's move on to more challenging questions.

dopeboydee · Answer

alright

sapphiremoon · Answer

lol Testing people is mostly for the OS Feedback section (which we basically use for general stuff).