Modeling Rates of Change: Quiz


Problem 5

Fill in the missing values in the table.

x y first derived second derived
0 1 3.05
0.2 1.494 3.08 1.625
0.4 2.11 3.405 0.925
0.6 2.791 3.59 0.575
0.8 3.509 3.705
1 3.785
1.2 5.007


Answers, problem 5

Using the definition for the average rate of change: (f(x+h) - f(x))/h, we can find the missing values in the table.

To find the first derived for when x = 0, we can say (f(x+0.2) - f(x))/0.2, where x = 0. Therefore (f(0.2) - f(0))/0.2 = (1.494 - 1)/0.2 = 2.47.

To find the value of y for when x = 1, we can say (f(x+0.2) - f(x))/0.2 = 3.785, where x = 1. Therefore (f(1.2) - f(1))/0.2 = 3.785 => f(1) = y = 4.25.

To find the second derived for when x = 0.8, we can say (f'(x+0.2) - f'(x))/0.2, where x = 0.8 and f' represents the first derived. Therefore (f'(1) - f'(0.8))/0.2 = (3.785-3.705)/0.2 = 0.4.

x y first derived second derived
0 1 2.47 3.05
0.2 1.494 3.08 1.625
0.4 2.11 3.405 0.925
0.6 2.791 3.59 0.575
0.8 3.509 3.705 0.4
1 4.25 3.785
1.2 5.007


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