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# Basic Math/Expert Profile

## Abe Mantell

Available
##### Expertise

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!

##### Experience in the area

Over 15 years teaching at the college level.

##### Education/Credentials

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

### Recent Reviews from Users

K = Knowledgeability    C = Clarity of Response    P = Politeness
Debbie06/01/16101010
Gabe04/12/16101010Thank you! Very detailed, much appreciated.
Jeffrey04/06/16101010Great example, even the knuckleheads I work .....
Russ Bryan04/05/16101010Very pleased with response time. On a .....
John01/19/16101010

### Recent Answers from Abe Mantell

#### 2017-01-30 The number pi:

Hello Tom,    These days, with the Internet, it is easy to get many digits of pi with great reliability.  For example:  http://www.factmonster.com/ipka/A0876705.html  http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits

#### 2017-01-16 mental math:

Good question!    Here are some places to read about it...  https://www.quora.com/How-did-Shakuntala-Devi-perform-such-huge-calculations-with-great-speed-and-precision  https://www.quora.com/How-did-Shakuntala-Devi-mentally-calculate-the-23rd-root-of-a-201-digit-number-correctly

#### 2017-01-07 Determing actual age from apparent age of characters:

Hello Julian,    Without additional info there are literally infinitely many possibilities!  The relationship could be (1) linear, (2) quadratic, (3) cubic, (4) exponential, (5) logarithmic,  (6) power

#### 2016-06-06 help:

Hello Aishwarya,    These websites should help:  http://www.whoinvented.org/who-invented-numbers/  https://en.wikipedia.org/wiki/Number  http://www.whoinventedit.net/who-invented-numbers.html  http://mathforum

#### 2016-05-23 How to combine two percentage (which may have overlap):

Hello Ahmad,    In this case we can use the well-known formula in probability: P(A or B) = P(A) + P(B) - P(A and B)    However, we only know P(A)=0.5 and P(B)=0.6, we need one more piece of info...either

Basic Math