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Hello, I am a college professor of mathematics and regularly teach all levels from elementary mathematics through differential equations, and would be happy to assist anyone with such questions!

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Over 15 years teaching at the college level.




B.S. in Mathematics from Rensselaer Polytechnic Institute
M.S. (and A.B.D.) in Applied Mathematics from SUNY @ Stony Brook

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Recent Answers from Abe Mantell

2016-12-29 Rates:

The 39,000 man-hrs is the amount of work done or to be done. So, it could mean 39,000 men work for  1 hour, or 3900 men work for 10 hrs, or 390 men work for 100 hrs, or 39 men work for 1000 hrs, or as

2016-12-26 Rates:

Here's one way...  195 men x 10 hrs/day x 20 days = 39000 man-hrs was required to complete the job.  That means the job requires 39000 man-hours.  if each man work 15 days for 13 hrs/day, then he works

2016-09-15 Speed Word problems:

I gather you meant ""How LONG does it take to travel..."  not "How FAR does it take to travel..." -- yes?    Also, you have that the boy gets back to AZ at 15:15 AM??  What is 15:15 AM???  15:15 would

2016-08-27 Math:

Hello Patricia,    Mathematically, it is true -- based on percentages.  But I suspect that there is more to this  than simple percentages.  Is the expected return directly proportional to the amounts you

2016-08-23 Rates:

Sorry, I did not notice the original question.  I need to revise my previous answer.    Let's look at from another point of view.  20 men can paint 5 houses in 10 days = 1 man can paint 5/20=1/4 of a house


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