# Math 112 Solutions for 5.6, p. 504

1.
(b) . (c) . (d) . (f) . (h) . (j) . (l) 6.

2.
(b) . (c) -4. (d) . (f) . (g) 2. (h) . (j) . (k) 1. (l) .

3.
(b) . (c) . (d) . (f) . (g) . (h) . (j) . (l) .

4.
(b) . (c) . (d)

5.
Let . Then

6.
(b) . (c) .

(b) .

(c) (i) . (ii) is the slope of the line from the origin to the point .

(d) (i) has maximum slope at about (ii) If is maximum, then . (iii) at about 5.5 weeks. (iv) Since , the condition is . (v) When the current sales level equals the running average , then is maximum. Beyond that, is decreasing, which means that will also be decreasing.

11.
If is increasing, is concave upward. Similarly, if is decreasing, then is concave downward.