# Ian

Member Since February 8, 2009

Retired chap. Enjoys helping others with maths and physics.

## Recent Activity by Ian

It is energy not "Eenrgy" as you wrote and your "anyting" is spelt anything, and later you write atheim rather than atheism, but never mind that, it is easy to make typos. Also, this was supposed ...

### Answered:Why cant energy be created?

In the past people thought that if you burnt a fuel it disappeared, but as chemistry developed it was discovered that the total mass of gases and any residues was equal to the original mass of fuel ...

### Answered:Can someone show me how to work out the ...

As a fraction you just divide 261/1481 which as a decimal is 0.17623 Percentage means hundreths so there will be 100 times more of these, so as Mickey said you move the decimal two places to the ...

It depends a lot on how much you understand already. Class notes provided by your lecturer or his/her recommended textbook will be designed to match what you need to know. A library may be able to ...

### Answered:What is 20% off of 20\$

20% off means you only pay the remaining 80%. Remember 80 percent means 80 hundreths or 80/100 which is 0.8 So, you only pay 0.8 *20 = \$16 Some people prefer to remember that 20% off is 1/5th off ...

If you square a Real Number, whether negative or positive you always get a positive result, (or zero). By contrast, an Imaginary Number is defined as one that that when squared gives a negative ...

### Answered:What is the rate in still water?

Right idea, tiny slip in arithmetic S - c = 63 S + c = 113 2S = 176 S = 88 c = 25 Regards - Ian

### Answered:Calculus 2 revolve 2 functions around x axis and ...

You did not quote range of integration Considering positive x from 0 to infinity Intersection at x = 2 and (theoretically) at x = 0 where functions tend to infinity Volume seen as ring or ...

### Answered:What is the product in math?

If you have two numbers, 5 and 7 say, their sum is 12 and their product is 35. So product means "the result when they are multiplied together" The product of 2, 3, and 5 is 2*3*5 = 30 Not to be ...

Functional analysis - what is it? Functional analysis is a branch of mathematics concerned with infinite-dimensional vector spaces (mainly function spaces) and mappings between them. The spaces may ...

## Contacts

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## Compliments

OronD says:
"Ian You are doing a great job in Yedda. I see many of your math answers and you are always clear and accurate. Best personal regards, OronD. "
MackTheKnife says:
"I really like your answers. They are very clear and well thought out. "