You are Here: Home >< Maths

# Quick Maths question help?!?

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016

1. Can someone explain this to me step by step please?
I tried going on the mark scheme but i only understood half of it.

ThanksðŸ˜ƒ

Posted from TSR Mobile
2. Bump

Posted from TSR Mobile
3. First you work out the Volume of the Ice Cream Cone thing. If the radius of the hemisphere is x, then the height is also x (both radii), so the height of the cone is 4x (5x-x).
The volume of the cone is:
The volume of the hemisphere is:
The total volume is:

The volume of the cylinder is:
Rearrange that to get:
4. height of cone is 4x (as 4x= 5x -x) the x comes from the height of the sphere

vol of cone = 1/3*pi*x^2*4x

vol of 1/2 sphere=4/6*pi*x^3

4/6 comes about as its half a sphere you must half it so 4/3 * 1/2

vol of cylinder = h*pi*(2x)^2

so 1/3*pi*x^2*4x + 4/6*pi*x^3= h*pi*(2x)^2

rearange h = (1/3*pi*x^2*4x + 4/6*pi*x^3)/(pi*(2x)^2)

simplify h = x/2

I did this quickly so i might be wrong, hope it helps, please note though I don't know if my answer is right I know it may be as it contains only 1 power of x so I know its a length, which I know h is, for example if h contained x^2 that would imply it was an area and therefore be wrong.
5. Thanks so much for the reply!
I finally get it now and i realized where i went wrong.

Posted from TSR Mobile

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: October 6, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### University open days

Is it worth going? Find out here

Poll
Useful resources

## Make your revision easier

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

Can you help? Study help unanswered threads

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.