You would end up with |x| = 30. Therefore, x = -30 and 30 Best regards. MPCTutor --------------------------------------------------------------------------- AP Calculus, AP Physics, Singapore Math Grades 7-12 --------------------------------------------------------------------------- US Central Time:5:46 PM 2/16/2010

To know precisely how your child is doing in say ACT Math, see her ACT math score. For New Jersey, a math score of 23.2 in the year 2008 indicated average performance meaning student's rank in NJ state schools would be 50th percentile. This same state rank looks better when brought to national level where the corresponding national average math score in ACT was only 21. If she competes within NJ on basis of her ACT math score she would have a tougher competition than if she competes with the same score at national level. Obviously, such analysis although correct will not necessarily change any individual's chances of admission because the college admission system does not work so much logically. However, parent and the student will always be better prepared when they have accurate information. Edit Note: When I wrote above reply, at that time there was another NJ parent with a question on Algebra and I cited data for NJ in reference to your post. In 2008 for Virginia schools the ACT Math score was 21.8 which was still above national average of 21.0. So a student with 21.8 ACT Math score had 50th percentile rank among Virginia students. Taking ACT at right grade level (when student is best prepared) is highly important. If you would tell what test she will need to take to establish her credentials in pre-calculus, I may be able to recommend some book. If a local community college professor is going to assign homework and give a tests periodically then I suggest she should do homework assignments from such professor and follow whatever book professor follows. However, there are other standardized tests for which textbooks or methods of preparation can be given. Preparing for a specific standardized test does not necessarily mean that student is not going to learn or learn only for test. It is in fact quite the opposite in case of most standardized test given at national and international levels. Student really needs to know material with deeper understanding since the testing is in significantly larger pool. Best regards. MPCTutor --------------------------------------------------------------------------- AP Calculus, AP Physics, Singapore Math Grades 7-12 --------------------------------------------------------------------------- US Central Time: 11:46 AM 2/16/2010 Updated at US Central Time: 5:32 PM 2/16/2010

The other poster is right. Part I ------- Mechanical advantage by definition is Load/Effort, hence MA = 100g/50g = 2 Part II -------- If you wrote 77,000kg * 9.8N=754600N, there will be sufficient reason to lose points. Correct answer would be (77, 000 kg) (9.8 m/s^2) = 754, 600 N Part III -------- As you pointed out mass would remain unchanged, thus mass = 77, 000 kg Weight is force which is directly proportional to g for a given mass m, hence weight would be (1/2)(754, 600) N = 377, 300 N Best regards. MPCTutor --------------------------------------------------------------------------- AP Calculus, AP Physics, Singapore Math Grades 7-12 --------------------------------------------------------------------------- US Central Time: 4:38 PM 2/8/2010

Assumption: You have Windows Vista PC (any windows should be sufficient but I am not confident about it) Steps: 1) Click start->Programs->accessories->Paint 2) In paint program Click File->Open and open the image file you want reduce. (For Avatar your original file should be square shape (y pixel by y pixel) 3) Once your image file is open, Click Image->Attribute on the menu bar of paint. Choose pixel in "units" and find what size your image is (it should be y by y). You want make that 80 by 80. Find what % reduction you will need. Note that calculated reduction and close attributes dialog box. 4) Now Click Image->Resize/Skew and change the height and width to get 80 pixel by 80 pixel size. Don't forget to save your original under different name to keep original intact. 5) Repeat above steps until you find correct size you want. Most likely, 60x60, 70x70 or 80x80 pixel^2 should look good. Best regards. MPCTutor --------------------------------------------------------------------------- AP Calculus, AP Physics, Singapore Math Grades 7-12 --------------------------------------------------------------------------- US Central Time: 5:01 PM 2/5/2010

I am in Fox Cities area. Thank you. MPCTutor US Central Time: 2:10 PM 2/3/2010

Hopefully the adobe pdf file should upload now. If upload fails I will place the file on our website. ---editing starts---- The upload failed hence I am giving link to the file I tried to upload. (You may need to copy paste following link to view the file content) http://www.mpclasses.com/CurrentLinks/Plain%20text%20math.pdf ---editing ends ---- Thank you. MPCTutor US Central Time: 1:09 PM 2/3/2010 --updated at US Central Time: 7:22 PM 2/3/2010

The image file attached earlier is not very clear. Please download one page document in its place. Thank you. MPCTutor US Central Time: 12:55 PM 2/3/2010

Hi all: My first post after testing how to post a few minutes back. 3-4 times a week I plan to to provide solution to calculus and physics problems posted here in this forum. My only requirement is that please check the problem statement for errors/typos. Also, if possible please do include the answer, particularly for Calculus FRQ (Free Response Questions as on AP exam). Knowing answer saves time to me in redundantly checking already correct solution. I plan to give solution in plain text format here in this forum and if I am not too busy, step by step YouTube type solution by email may be requested from me off the forum. If someone else wants to post the solution please feel free to jump in. Copying math problems in email/forum itself is often times major obstacle. Please see if I could attach an image file that explains how to format math problem with its symbols, superscript, subscript etc. without deviating from the actual problem statement. I have some high school level textbooks from Singapore math (New elementary math, New syllabus math, New additional math) and I will be able to see the problem statements in my copies (hopefully my book edition matches with that of yours). I also have a copy of O level physics from Singapore. Most of the students I tutored/helped online have used very many different calculus textbooks (for both AP Calculus AB and BC) that it is cost prohibitive for me to own so many textbooks. If you need solution to problems from such textbook, I will have to depend entirely on your version of the problem statement. By the way I am in Wisconsin in Fox Cities area. Thank you. MPCTutor US Central Time: 12:38 PM 2/3/2010

First post as a test. Thank you. MPCTutor US Central Time: 12:06 PM 2/3/2010