Enable contrast version

# Tutor profile: Pavleen K.

Inactive
Pavleen K.
Masters Student at University of Southern California
Tutor Satisfaction Guarantee

## Questions

### Subject:Linear Algebra

TutorMe
Question:

What is the trick to finding the inverse of a 2d matrix quickly.

Inactive
Pavleen K.

Its actually quite simple. Just swap the numbers on the primary diagonal, that is the numbers on the top left and bottom right. And change the signs of the numbers on the secondary diagonal, that is the numbers on the top right and bottom left. So if there is 2 on the top left and 3 on the bottom right, the inverse matrix will have 3 on the top left and 2 on the bottom right. And if there is 4 on the top right and -2 on the bottom left, the inverse matrix will have -4 on the top right and +2 on the bottom left.

### Subject:Geometry

TutorMe
Question:

What is the surface area of a rectangle ( 10 X 4 cm sq ) folded into a hollow cylinder, along its longest side, from end to end?

Inactive
Pavleen K.

The surface area of a hollow cylinder is given by : 2*pie*r*h To find this, we need the values for 'r' and 'h'. Since the rectangle is folded along its longest side, that is 10cm, the height of the rectangle will be the height of the cylinder that is 4cm ( h ). The circles so formed at the bases of the cylinder would have a circumference equal to 10cm, since it was folded along that side. The circumference of a circle is given by : 2*pie*r We have the value for 'h', which is 4cm. We can find the value of 'r' from above. 2*pie*r = 10, r = 10 / (2*pie ) = 5/pie Which implies, the surface area of the cylinder is : 2*pie*(5/pie)*4. Which gives the answer 40 cm square!

### Subject:Basic Math

TutorMe
Question:

What would the answer to the following : 2 + 2 - 2 / 1 * 2 ?

Inactive
Pavleen K.

## Contact tutor

Send a message explaining your
needs and Pavleen will reply soon.
Contact Pavleen