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Did he divide the two equations together? :s sorry im not sure

this is our very first lesson on rtes of change ever

he has differentiated.... I'd presume that you know how to differentiate...

No...he didnt teach us that...ill look over my notes. seems like hes teaching himself sometimes

It'll take a while but I'lltry toprocess what you said haha

should I google differentiate and teach myself?

thats correct...
once you have the 1st derivative... then you can find the slope of a tangent at a specific point on the curve.
here is all the information graphed. Hope this helps

rates of change is the slope at that point

http://www.calculus-help.com/tutorials
these are good videos for an intro of calculus

btw the power rule is one of many ways to take the derivative of a function.

Thank you very much. @campbell_st Thanks for the graph!