# Homework Help: Calculus and Vectors & Matrices Assignments

1. Jun 21, 2010

### CrazyEgg

1. The problem statement, all variables and given/known data

A field is defined by f(i)=2i+1; f(j)=(j^2)-2 and f(k)=(-k^2)-2
a. Describe the Surface
b. Find the gradient of the surface at the point

This is the last question of an assignment but I actually have no dea on how to even start doing it.

Also I've finished 2 assignments, but I really need to get 100% on both so is it possible for someone on here to check thorugh my working out please?
One is a calculus assignment and the other is vectors and matrices (the question above is from that assignment)

Hope you can help

Thanks

2. Jun 21, 2010

### HallsofIvy

What surface? You have not given any surface!

What point? You have given no surface and no point.

If you give your working and answers here, we'll see what we can do.

3. Jun 22, 2010

### CrazyEgg

that's the weird thing about the question, all the information that I typed is all the info that it gives.
I'll be going in today to actually ask the teacher about it.

The thing with the other 2 assignments is that they are in 2 pdf files, should I post a zip file of the 2 assignments on this thread?

4. Jun 22, 2010

### HallsofIvy

in any case, this makes no sense. I assume that i, j, and k are the unit coordinate vectors but then "2i+ 1" , "j^2", and "k^2" are not defined. Does the problem say anything about what i, j, and k are?

5. Jun 22, 2010

### CrazyEgg

I looked over the entire assignment and I found points for i, j and k in 2 different questions
i and j are position vectors while k is a 3d position vector

i= (6, -2) j= (-4, -3) and k=(3, 4, 0)

Does this help?

Also Ivy, could you have a look at my assignment work?
you could pm me your e-mail and I can send them to you as an attachment?

6. Jun 24, 2010

### CrazyEgg

Is there still something wrong with the question?

This is the only question that I have not answered in my assignment and I would really appreciate it if you could help me out please.

7. Jun 27, 2010

### CrazyEgg

I spoke to my maths teacher on friday and he said that the question was fine.

He also said that the assignment needs to be typed up on the computer and even though I wrote mine using a wacom tablet in pdf format he says that I won't be eligable for the top grades because it is not typed up.

It would be amazing if someone could type it up for me and I can actually pay them to do it. I have already answered all the questions (except that question on my first post) so all you would need to do is give it a check and type it up

Any help will be appreciated.