# Ian

Member Since February 8, 2009

Retired chap. Enjoys helping others with maths and physics.

## Recent Activity by Ian

Show:

### 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 ...

### Answered:How does 1+1 equal 3?

Let x = 1 i.e. 1 = x d/dx[1] = d/dx[x] 1 + 1 + d/dx[1] = d/dx[x] +2 1 + 1 + 0 = 1 + 2 = 3 1 + 1 = 3 (but not really of course) Regards - Ian

## Contacts

Ian has no contacts.

## 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. "