April 20, 2014

Homework Help: precalculus

Posted by Melinda on Saturday, December 3, 2011 at 11:50am.

Can someone verify if my answer is right?

1. Which function has a negative average rate of change on the interval 1<x<4

a) f(x) = x^2 - x - 1
b) g(x) = 1.6x - 2
c) h(x) = -x^2 + 9
d j(x) = -3

I picked d, because I subsitute all the numbers for all letters and the only negative one was D because there is no x value to add in.
2. For which value of x is the instantaneous rate of change of h(x) = 0.5x^2 + x - 2 closest to 0?

a) x= -1
b) x= -1
c) x= 0
d x= 1

I chose B
3. A student is walking in a straight line in front of a motion sensor. What does he need to do to produce a horizontal segment on the distance versus time graph?

a) move quickly toward the sensor
b) move slowly toward the sensor
c) stand in place
d) move quickly away from the sensor

The answer is c.

4. A student is walking in a straight line in front of a sensor. The sensor begins collecting data when the student is 6m away. The student walks toward the sensor for 4 s at a rate of 0.5 m/s. Which of the points on the graph of the distance versus time graph for this walk?

a) (6, 0)
b) (8,2)
c) (10,6)
d) (12,6)

I chose D.

Help appreciated~

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