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    how many multiples of 5 between 25 and 750 inclusively and show the formula

    which formula am I suppose to use? Sn=a(1-Rn)


                                                                                ----------                                                                                1                                                                             1-R                                                

    0  Views: 2960 Answers: 3 Posted: 11 years ago

    3 Answers

    N = (max - min)/k+1


    25 and 105 are divisible by 5. So.....................


    105 - 25 = 80/5 = 16 + 1 = 17

    Bob/PKB

    You used 105 instead of 750, but your logic is perfect.

    I think you should divide 750 by 5  (150) and subtract 4, because you are not going to include the 5 10, 15, and 20, which are multiples of 5 and not included in your parameters of 25 - 750
    There are 20 multiples of 5 in every 100, so 20 x 7 = 140 multiples between 0 and 750.  There would be 1/2 (20) because 50 is half of 100, and you need to add another 10 multiples.  That gives you 150 multiples multiples of 5 between 0 and 750.  Now, subtract the 4, and you get 150-4 = 146


    I'd write the equation like this:   [(20 x 7) + (10 x 1)] - 4 = [140 + 10] - 4 = 150 - 4 = 146


    or, using Chellanne"s formula:  (750 - 25)/5  + 1= 725/5  + 1= 145 + 1 = 146

    itsmee

    In the third grade I had a stinky, old, red math book. At that time, I hated the book. Really. I turned off to math at that time. Somehow I got through Algebra ... but I didn’t go further.
    I think you are soooo smart! Congratulations.
    Now we have something new with Tech every day. (Or at least I do.)
    Bob/PKB

    I am not that smart, itsmee. Muddling thru pre-algebra as a sub and my sons' homework gave me a better understanding. No math for me since algebra 1 back in 1970
    chelleanne

    Thanks, for mistake!

    Homework Help. You can ask any homework questions ,and many teachers will help you to answer it >> http://homework.boodom.com/ 



    Deleted User

    This is silly Colleen I have no votes left but n an TD ? Why is that?
    Colleen

    Moderator
    Why is what? The TD? Why did you give me and Python a TD?
    Deleted User

    It happened by accident when I was reading pythons comment and I realised I have no votes so ow can I TD if I have no votes? I was showing you on a SEPERATE post as an example..
    Colleen

    Moderator
    Having no vote ups left does not take away from the TDs you have left.


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