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Mathematics 19 Online
OpenStudy (anonymous):

a group of concert tickets cost $88 for 4 people and $180 for 10 people. what is the rate of change per person?

OpenStudy (oaktree):

We go up by $98 for 6 people, so our rate of change is\[\frac{ $98 }{ 6} = $16.33/person\]

OpenStudy (anonymous):

Can you explain why? I'm TOTALLY lost...

OpenStudy (oaktree):

When we add 6 people to the number of people buying, our price goes up by $98. That's all.

OpenStudy (oaktree):

Wow sorry it's $92. I can't subtract. The answer is $15.33, not $16.33. Sorry.

OpenStudy (anonymous):

And that isn't right, it's multiple choice so it is either A. 9.20, B. 15.33, C. 17.00, or D. 19.14

OpenStudy (anonymous):

Thanks!!!!

OpenStudy (anonymous):

Wait, where does the 6 and the 92 come from? I still don't get how to solve it

OpenStudy (oaktree):

We increase by 6 people and by $92 dollars. Here's the formula:\[\frac{ Price _{final} - Price_{initial} }{ People_{final}-People_{initial} }\]Understand? We subtract the final price from the initial price and divide by the change in the number of people.

OpenStudy (anonymous):

OOOOHHHHHH yes, sorry I get it now lol

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