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Math Help - Formulas

  1. #1
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    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.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kimmy1984 View Post
    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
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  3. #3
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    Formulas

    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
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kimmy1984 View Post
    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.
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  5. #5
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    Formulas

    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.
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by kimmy1984 View Post
    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
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  7. #7
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    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.
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