Hints for homework on Chapter 2:
# 63: This function has 2 parts:
First: if x (income) is less than or equal to 20,000, one pays 15% of x
Second: if x is greater than 20,000, one pays 15% on the first 20,000 PLUS 20% on the remaining income
(x-20,000).
# 65: This function has 3 parts:
Let x be the number of copies sold.
First; pay 10% of $12 for each copy sold, if x is less than or equal to 10,000
Second: pay 10% of $12 on the first 10,000 copies PLUS 12.5% of $12 for each copy sold above 10,000 but below 15,000.
Third: pay 10% of $12 on the first 10,000 copies PLUS 12.5% of $12 for each copy sold above 10,000 but below 15,000 PLUS 15% of $12 for each copy above 15,000.
Section 2.1:
§2.1 # 57. See Example 7 on page 56. Recall: 
. Notice: 
. What is width? Height?
§2.1 # 59 (a). Use 
.
(b). Total cost = cost of sides (y) (notice there are 2 sides of length y)
plus cost of side of length x
plus cost of the sides with the doors.
§2.1 # 61 Notice that h is the height of the building.
§21. # 65 Use Pythagorean Theorem: 
. In this case, the distance d corresponds to c.
§2.1 # 67 Use Pythagorean Theorem. Notice that the hypotenuse has length r+h.