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yes upload...

Give me a moment its not pasting

hmmm...

I just don't understand what they're asking me to do.

maxima is the maximum profit of the company in that number of erasers

rate of change= dy/dx

in this case take out the points from the graph, x=1 and x=4

Okay, then you just average it out, right?

270-90/4-1.
This will give you, dy/dx

Okay, that's 60, right?

good job

Thank you ^.^