- 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.