# Math 230: Homework Problems

Homework is optional in this course. However, your success in differential equations is strongly related to the amount of homework you do. As an incentive to encourage students to do the homework, and thus improve their exam scores, I will replace your lowest regular exam score with your homework point total if the homework total is higher.

I suggest that you copy the original problem down where possible. Also show plenty of work. The final exam is open notebook, and it will be beneficial to you at that time to have the original problem should one of the problems appear on the test.

There are 324 problems in 38 sections of homework for an average of about 8.5 problems per section.

Each section of homework will be worth 2 points based on the percent of problems you have correct. Those two points per section are to be assigned by you as follows. Grade your own homework according to the answers in the back of the textbook, marking each problem as correct or incorrect. If a problem is initially wrong, you may fix it and then count it as correct. After corrections are made, record the number correct as a fraction (8/9) and percent 89% at the top of the first page of each section of homework. Assign 2 points if you have at least 75% of the problems correct. Assign 1 point if you have at least 50% correct. Assign 0 points if you have less than 50% of the problems correct. Record your point totals in the table below and turn in the homework and this point total sheet at the beginning of each exam.

Points Percent Correct
2 75 - 100
1 50 - 74
0 under 50

Since 38 sections of homework only accounts for 76 points, the other 24 points will be awarded as follows. You may receive a maximum of 100 points for the homework grade (even though there are 101 possible).

For each exam, the instructor will assign up to five (5) points towards your homework total. Those five points will be based upon the following rubric. One point will be awarded for each category where the description is met.

Category Description
Identification Sections are clearly identified and each section begins on a separate piece of paper. Student's name is on papers.
Properly Graded The top of each section is identified with the number and percent of problems correct and the number of points. The homework point sheet is completed.
Work Shown It is obvious that the student did the problem and just didn't copy answers from the back of the textbook or the solutions manual.
On Time Homework was turned in at the beginning of class on the day of the exam.
Random Problem One assigned problem will be randomly selected and graded by the instructor. If the student has completed the problem correctly, then this point will be awarded.

All assigned problems are odd numbered unless otherwise noted.

Pts Sec # Problems
_____ 1.1 12 1, 3, 5, 7, 9, 11, 13, 15, 17, 23, 27, 28
_____ 1.2 13 1, 3, 7, 11, 17-25, 35-38 all
_____ 1.3 9 1, 5, 7, 9, 15, 17, 21, 23, 27
_____ 2.1 7 5, 9, 13, 15, 19, 21, 25
_____ 2.2 9 1, 5, 7, 11, 17, 19, 21, 23, 25
_____ 2.3 9 1, 5, 9, 13, 17, 21, 25, 29, 33
_____ 2.4 11 3, 5, 7, 13, 17, 21, 25, 27, 31, 35, 37
_____ 2.5 9 1, 5, 9, 11, 13, 15, 21, 25, 29
_____ 2.6 4 1, 3, 5, 9
_____ 3.1 10 1, 5, 11, 13, 17, 19, 25, 29, 33, 36
_____ 3.2 5 1, 5, 11, 15, 19
_____ 3.3 4 5, 11, 13, 15
________     Chapters 1-3 Total
_____ 4.1 10 1, 3, 9, 13, 15, 19, 23, 27, 31, 33
_____ 4.2 6 1, 5, 9, 13, 17, 19
_____ 4.3 17 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 43-48 all
_____ 4.4 12 1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45
_____ 4.5 12 1, 7, 13, 19, 25, 31, 37, 43, 49, 55, 61, 67
_____ 4.6 7 1, 5, 9, 13, 17, 21, 25
_____ 4.7 10 1, 5, 9, 13, 17, 21, 25, 29, 33, 37
_____ 4.8 6 1, 5, 9, 13, 17, 21
_____ 4.9 6 1, 3, 7, 11, 13, 15
________     Chapter 4 Total
_____ 5.1 10 9, 11, 17-20 all; 25, 33, 37, 49
_____ 5.2 10 1, 3, 5, 9-19, 27
_____ 5.3 5 1, 3, 9, 14, 17
_____ 6.1 7 3, 11, 15, 17, 21, 25, 29
_____ 6.2 10 1, 5, 9, 11, 13, 15, 19, 23, 27, 31
_____ 6.3 8 1, 5, 9, 13, 17, 25, 45, 47
________     Chapters 5-6 Total
_____ 7.1 8 1, 7, 13, 19, 25, 31, 37, 41
_____ 7.2 8 1, 7, 13, 19, 25, 31, 35, 39
_____ 7.3 19 1, 5, 9, 13, 17, 21, 25, 29, 37, 41, 45, 49-54 all; 57, 67
_____ 7.4 11 1, 5, 9, 13, 21, 27, 31, 37, 41, 45, 49
_____ 7.5 4 1, 3, 7, 11
________     Chapter 7 Total
_____ 8.1 5 5, 9, 15, 19, 23
_____ 8.2 11 1, 5, 9, 13, 19, 23, 29, 33, 37, 43, 45
_____ 8.3 8 1, 5, 9, 13, 17, 21, 25, 29
_____ 8.4 6 1, 5, 9, 15, 19, 23
_____ 9.1 3 1, 5, 9
_____ 9.2 3 3, 7, 11
________     Chapters 8-9 Total