Estimate the derivative from the table of average rates of change. HINT [See discussion at the beginning of the section.] (Round your answer to one decimal place.)
r'(7)=

Consider the function as representing the value of an ounce of palladium in U.S. dollars as a function of the time t in days.€ 
R(t) = 280 + 20t3; t = 1
Find the average rate of change of R(t) over the time intervals [t, t + h], where t is as indicated and h = 1, 0.1, and 0.01 days. (Use smaller values of h to check your estimates.) HINT [See Example 1.] (Round your answers to one decimal place.)

Estimate the instantaneous rate of change of R at time t, specifying the units of measurement.R'(1) = ---Select--- $/oz $/item $/yr $/day

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0.1 0.0001 0.001 0.01 -10.5 Ave. Rate of -8.55 -8.532 -8.50030 -8.5000082 Change of rOver [ 7,7+ h] -0.1 -0.01 -0.001 -0.0001 -1 Ave. Rate of Change of rOver [7 + h, 7] -6.6 -8.47 -8.488 -8.49986 -8.4999920 0.1 0.01 Ave. rate