**
Hints for homework on
Chapter 2:**

__Section 2.2:__

# 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.