The Function $R ( t ) = 1,120 + 79 t - t ^ { 3 }$

question 7

Multiple Choice

The function $R ( t ) = 1,120 + 79 t - t ^ { 3 }$ represents the value of the U.S. dollar in Indian rupees as a function of the time t in days. Find the average rates of change of $R ( t )$ over the time intervals $[ t , t + h ]$ , where t is as indicated and $h = 1$ , $0.1$ , $0.01$ , and $0.0001$ days. Hence, estimate (using $h = 0.0001$ ) the instantaneous rate of change of $\text { R }$ at time $t = 2$ .
Select your answer rounded to the nearest whole number.

• A)63
• B) 69
• C) 64
• D) 67
• E) 68

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