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About Ian

Retired chap. Enjoys helping others with maths and physics.

Member Since February 8, 2009
61, Male

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A:

1.both digits are greater than 3. 2.the sum ...

Possibilties before rules: UNITS: 1 2 3 4 5 6 7 8 9 TENS: 1 2 3 4 5 6 7 8 9 Rule 1: Digits are greater than 3, so new possibilities are UNITS: 4 5 6 7 8 9 TENS: 4 5 6 7 8 9 Rule 2: Sum of digits ...
Submitted by Ian 1 day ago
0 comments


A:

Please, help me with this qustion: Suppose that ...

Number of infections in millions, N = sqrt(x) +3 where x is years from now a) How many cases of the infection will there be 9 years from now? Answer: 6 million infections Show the work here ...
Submitted by Ian 1 day ago
0 comments


A:

Required force of sled

Yes, F (Newtons) = m (kg) x a (m/s^2) = 150 x 0.71 = 106.5 Newtons Regards - Ian
Submitted by Ian 3 days ago
0 comments

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Q:

Strong metal cover for mechanics pit

Strong metal cover for mechanics pit I need to cover a large mechanics pit in a garage so that no vehicle wheel can slip into it ...
Submitted by Ian   2 months ago.
  • 1 answer
  • viewed 52 times
Last answer posted 20 days ago by jamie


Q:

Posting problems sign in rejected

Posting problems: I prepare an answer but then have a problem posting. Signing in sometimes works, but often fails when ...
Submitted by Ian   5 months ago.
  • 3 answers
  • viewed 80 times
Last answer posted 5 months ago by Ian


Q:

Lost location of this maths (polynomial factors) question. how do i find it again

Was posting answer to factoring this x^4 + 3x^3 - 9x^2 -23x - 12 but lost question location when required to reset password. How ...
Submitted by Ian   8 months ago.
  • 3 answers
  • viewed 199 times
Last answer posted 8 months ago by profitbob

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Comment to jamie's answer

Good idea. Might do that. Thanks for replying. Reghards - Ian
Submitted by Ian 15 days ago

Q:

For p a prime, the poloynomial p[x]=x^p-Sum[x^j,{j ...

For p a prime, the poloynomial p[x]=x^p-Sum[x^j,{j,0,p-1}] is irreducible over the rational numbers Q. Conjecture: p[x] is ...
Submitted by TMatrix   18 days ago.
  • 1 answer
  • viewed 25 times
Last answer posted 4 days ago by Ian


Q:

What is the least possible perimeter of a triangle ...

what is the least possible perimeter of a triangle whose sides have different positiv integers as its length?
Submitted by Austin   1 month ago.
  • 1 answer
  • viewed 51 times
Last answer posted 1 month ago by Ian


Q:

Is there theoretical evidence behind the basics for multiplication of complex numbers?

When I learned that the product of two imaginary numbers became the negative of the real-factor equivalent product, I did not get ...
Submitted by frevelm   4 months ago.
  • 2 answers
  • viewed 144 times
Last answer posted 4 months ago by Ian

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Compliments (1)

Go on make Ian's day...
Take a sec and thank him for his help :)
MackTheKnife says:
"I really like your answers. They are very clear and well thought out. "
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