Thread: Formulas

Can someone tell me what this formula means and why it is set out like this?
If you have a mobile phone and you pay £15 for 30 mins and anything over is charged at 10p per min this is how the formula is set out.

Total monthly cost in £=15 + (total number if minutes used -30)x0.1

I'm trying to learn how to write formulas for maths but im finding it really hard and don't fully understand it.

Originally Posted by kimmy1984

Can someone tell me what this formula means and why it is set out like this?

Total monthly cost in £=15 + (total number if minutes used -30)x0.1

I'm trying to learn how to write formulas for maths but im finding it really hard.

this is not a "general" formula for anything. it seems this formula is specific to the question. give us the original question and we will show you how to come up with the formula

Im new to this site and im doing a home course in maths, i have done ok so far untill i come to this question and i dont understand it.

The wheels on a bike have a circumference of 2 meters. Each time the front wheel makes one complete revolution, the bicycle moves forward 2 meters. in your mown words describe how to work out the distance travelled by the bicycle if you know how many revolutions the bicycle has made.
Hence write down a word formula for the distance travelled.
The formula should start:
distance travelled in m =........
I'm so

Originally Posted by kimmy1984

Im new to this site and im doing a home course in maths, i have done ok so far untill i come to this question and i dont understand it.

The wheels on a bike have a circumference of 2 meters. Each time the front wheel makes one complete revolution, the bicycle moves forward 2 meters. in your mown words describe how to work out the distance travelled by the bicycle if you know how many revolutions the bicycle has made.
Hence write down a word formula for the distance travelled.
The formula should start:
distance travelled in m =........
I'm so

what about the first question? you haven't told us the question for that.

sorry like i said im new to this the second reply is the question, the first post was a mistake i just thought by understanding the first one i may be able to figure out the question.

Originally Posted by kimmy1984

Im new to this site and im doing a home course in maths, i have done ok so far untill i come to this question and i dont understand it.

The wheels on a bike have a circumference of 2 meters. Each time the front wheel makes one complete revolution, the bicycle moves forward 2 meters. in your mown words describe how to work out the distance travelled by the bicycle if you know how many revolutions the bicycle has made.
Hence write down a word formula for the distance travelled.
The formula should start:
distance travelled in m =........
I'm so

since the bicycle travels 2 meters for every one revolution, the distance traveled in m is 2r, where r is the number of revolutions, that is, for every revolution we move 2 meters, so we just multiply 2 meters by how ever many revolutions the wheel makes

Sorry for keep posting and ty for reply. like an idiot i thought when it said: Distance travelled in m=. i thought m meant miles.