Answer:
Average rate for the given function is 1 / 7
Step-by-step explanation:
The average exchange rate corresponds to the ratio between the variation of the function and the variation of the variable. That is to say,
Average rate = [f (x2) - f (x1)] / (x2 -x1). Since x1 = 6 and x2 = 13, you have:
f (x1) = f (6) = sqrt (6 + 3) - 2 = 3 - 2 = 1
f (x2) = f (13) = sqrt (13 + 3) - 2 = 4 - 2 = 2
In this way,
Average rate = (2 -1) / (13 - 6) = 1/7
