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# Algebra/Expert Profile

## Abe Mantell

On Vacation
returns 12/25/2016
##### 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.

##### Organizations

NCTM, NYSMATYC, AMATYC, MAA, NYSUT, AFT.

##### 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
JohnnyX08/24/16101010Your unique knowledge and the way you .....
emmanuel08/09/16101010
Prashant S Akerkar 07/24/16101010Dear Prof Abe Thank you. Prashant
Prashant S Akerkar 07/24/16101010Dear Prof Abe Thanks. Prashant
Alice07/10/16101010Thank you so much!

### Recent Answers from Abe Mantell

#### 2016-07-10 Finding n:

Hello Alice,    Whenever two fractions are equal to each other, we can always "cross multiply"  and get an equivalent equation.  Thus, 6/(n-4)=10/n becomes 6n=10(n-4), now  distribute the 10 on the right

#### 2016-03-17 albebra:

Let x=the cost per tennis racquet, and y=the cost per pair of tennis shoes.    Thus, we get:  1. 150x + 50 y = \$14,000  and  2. 80x + 30y = \$7,650    We can simplify each... 1. divide through by 50, 2

#### 2015-01-28 fractions:

Hello Desirai,    Have you searched the Internet for help sites?    Here are some links for you:  http://www.purplemath.com  http://www.sosmath.com  http://mathforum.org/dr.math/  http://math.whatcom.ctc

#### 2015-01-27 algebra 2:

Assuming the 128 ft/sec is vertical (i.e. straight up), then...  h(t)=128t-16t^2 gives the equation of motion in the vertical direction  (i.e. the height above the ground).  Since this is a parabola, we

#### 2015-01-23 A factoring question:

Hello Tressa,    Consider this problem:  2x+6y-2=2(x+3y-1), yes?    Now look at: (1/2)x+(3/2)y-1/2=(1/2)x+(1/2)*3y-(1/2)*1,  now factor the common factor of 1/2 (just like in the above problem we factored

Algebra