Posted by Lina on Tuesday, February 19, 2013 at 2:29pm.
A total revenue function is given by R(x) = 1000(x^2  0.1x)^1/2 , where R(x) is the total revenue, in thousands of dollars, from the sale of x items. Find the rate at which total revenue is changing when 20 items have been sold.

Business calc  Steve, Tuesday, February 19, 2013 at 2:36pm
that would be dR/dx when x=20
R = 1000(x^2.1x)^2
R' = 2000(x^2.1x)(2x.1)
R'(20) = 31,760,400

Business calc  Anonymous, Friday, February 22, 2013 at 2:11am
Calculate the amount of interest on a loan of $3,200 at 6% interest for 60 days using
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