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Lesson 1 Questions: Rate of Change and Differentiation Rules — Lesson quiz

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1.
The second derivative of y = x4 − 2x3 + 5 is:
12x2 − 12x
4x3 − 6x2
12x2 − 6x
24x − 12
2.
For f(x) = |x − 3|, the derivative f′(3) is:
Equals 0
Equals 1
Does not exist, since the left and right derivatives (−1 and +1) differ
Equals −1
3.
A 10 m ladder slides down a wall while its foot moves away at 1.5 m/s. When the foot is 6 m from the wall, the top moves down at:
1.125 m/s
2 m/s
1.5 m/s
0.9 m/s
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