hence
a. R(x) = -12.16x^2+254.28x-105.6
b. Rate of change
r(9.25) = $29.32
r(11.50) =-$25.40
c. R(10.25)-R(9.25)= $17.16 and
R(12.50)-R(11.50)= -$37.56
d. The marginal revenue is found using a linearization of R(x). R(x) is concave down with maximum value. When r(x)>0, linearization overestimates the change because the tangent is abouve R(x). Thus the approximate change in an oversrimate of the change in price from $9.50 to $10.25.
Thank you!
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