# (115) Homework 8(Due 12/1)

Hi all,

Our quiz is postponed to Dec 1, which is the Thursday after Thanksgiving. Here is a set of problems due on the same day:

6.1: 6, 8, 15, 16, 23

7.1: 7, 8, 16

7.2: 1, 4

9.1: 2, 4, 8, 10, 12, 14, 15, 35,36,38,40

9.3: 1,2,5,6,8,11,12,21,22,24

# (115)Homework 7(Due 11/10)

Hi all,

We are having a second test on Thursday, and here is a set of problems to help you review chapters 3, 4, and 5

3.1: 4, 14, 22,60

3.2: 3,5,7,9

3.3: 3,15,27

3.4: 5,6,9

4.1: 1,2,25,26

4.2: 3,5,13

4.3: 3,7,13,19

5.1: 9,13,21,37

5.2: 1,2,6,22

# (115) Homework 6(Due 11/03)

4.3: 1,2,5,6,11,12,17,18, 38(similar to 37)

5.1: 1,2,19,20,25,26,33,34,47,48

# (115)Homework 5(Due 10/28)

Problems to hand in:

3.4: 10, 13, 19,20

4.1: 3,6,7,8,10,12,17,18,25,26

4.2: 1,2,4,6,13,19,22,23,25,28

# (115)Homework 4(Due 10/20)

3.3: 1,2,4,6,9,10,16,18,25,26,33

3.4: 1,2,5,6

# (115)Review problems

Hi all,

we have our first test on Thursday, Oct 6. The following is a set of review problems that is never due. But you can hand them in for extra credits.

1.2: 6,7,11,18,23,24,31,33,38,43

1.3: 1,3,7,11,22,24,43

2.1: 13,15,19,25,29(Hint: $c=a\pi r$)

2.2: 5,6,15,31,41

2.3: 15,56

3.1: 2,4,5,14,20,22,26,28,46,54,59,60,63,65(drawing a picture might help)

# (115) Summary of lines

Hi all,

Last week we spent some time on lines, and with all the different forms you learned, I think it might be a good time to sum them up a little.

To find a line, you need two pieces of information: the direction of the line, and the position of the line, it doesn’t matter how you get these information. Like making a burger, you need some bread and some patty, it doesn’t matter where you buy the bread and patty.

The position of a line is always given by a point on the line. It might be the $y$-intercept, or just any generic point $(x_1,y_1)$ on the line.

The direction of a line is given by slope (or undefined, in case the line is vertical). It might be directly given to you, and there are many ways of grabbing this information:

1. Any two points $(x_1,y_1)$ and $(x_2,y_2)$ on the line gives the slope by $\frac{y_2-y_1}{x_2-x_1}$
2. The line is parallel to a line you already know. For example, if your line is parallel to $3x+2y=5$, you know your line has slope $-\frac{3}{2}$, as parallel lines have the same slope.
3. The line is perpendicular to a line you already know. For example, if your line is perpendicular to $3x+2y=5$, you know your line has slope $\frac{2}{3}$, as perpendicular lines have slopes that multiple to be -1.

# (115 Updated 9/27)Homework 3(Due 9/29)

Hi all,

Here is the homework due next Thursday:

2.2: 29,30,39,40,45,46

2.3: 13,14,17,18,55,56 Extra credit problems: 21,22.

Extra credit problems: 2.4: 5,6,9,10,11,13

Please hand in the extra credit problems to me separately. We are not going to cover section 2.4, so problems from section 2.4 becomes optional extra credit problems.

# (115)Homework 2(Due 9/22)

Section 1.3: 18,20,28,30,44,48,52

Section 2.1:4,6,8,11,12,17,18,26,27,28

Section 2.2: 3,4,11,12,13,14,29,30,39,40,45,46

# (115)Homework 1(Due 9/15)

Hi all,

Here is the first set of homework due next week:

Section 1.1: 10, 13

Section 1.2: 8,15,16,19,21,26,30,32,39,40,47,48

Section 1.3: 2,4,5,6,9,10

Here is an article about Hippasus and $\sqrt{2}$