Archive for the ‘Math Help’ Category
Math Help Long Division
July 31st, 2011
Question: Math Help! Calculate using long division?
I know how to do it but i keep getting the wrong answer, hopefully someone could show me how to do it and i can figure out where i’m going wrong.
(3x^3 – 4x + 5) ÷ (x-2)
Wow! thanks so much for writing it out for me vadersdemise_93, appreciate it 
Answer: Hey!
I solved the problem for you on a piece of paper so you could see how to work it out! I also explained the steps.
Here is the picture!
http://img809.imageshack.us/f/1021001948.jpg/
Good luck!
Secret Trick : Math Division Long
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Math Help With Fractions
July 29th, 2011
Question: Need help with this math/fractions problem please?
Monica spent 7/11 hours listening to tapes of Beethoven and Brahms. She spent 1/4 listening to Beethoven. How many hours were spent listening to Brahms?
Do I subtract the fractions?
Answer: = 7/11 – 1/4(7/11)
= (28 – 7)/44
= 21/44
Answer: 21/44
Fractions & Proportions : How to Add & Subtract Fractions
Math Help Permutations
July 28th, 2011
Question: Please Help With Math permutations problem?
1. In how many different ways can 6 knights be seated in 6 chairs around a round table?
2. In how many different ways can 9 people be lined up in a row if 2 of them must stand next to each other?
3. The manager of a baseball team wants the best hitter up fifth. If the lineup consists of 9 players, how many different lineups are possible?
Answer: 1. Since you specified a round table, I will assume it does not matter if you shift everyone around keeping them in the same order. Put 1 person in any seat. Then you can choose among 5 people to sit to his right, 4 people to sit to the right of that person, etc. So you have 5*4*3*2*1 or 120 ways.
2. Count the 2 people who must stand next to each other as 1 person. so you have 8*7*6*5*4*3*2 = 40320 ways. Or you can switch the order of those 2 people, giving you another 40320 ways, for a total of 80640.
3. The best hitter is fifth, so you can rearrange the other 8 players in 8*7*6*5*4*3*2*1 = 40320 ways.
GMAT Math Permutation & Combinatorics II | Manhattan Review GMAT Prep