Hints for homework on Chapter 2:

 

Section 2.5:

 

Section 2.4:

 

Section 2.3:

 

 

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.