pre algebra

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what is the value of the expression?
15-6/3.2+7-1

  • pre algebra -

    I got 20 because you have to PEMDAS which is Parentheses Exponents Multiplacation Division Addition Subtraction. 15-6/3.2+7-1 First you have multiply 3 & 2 and you get 6. then you divide 6 by 6 and get 1. Then you minus 1 from 15 that equals 14 because you have to add and subtract from left to right. Then 14 + 7 = 21-1=20

  • pre algebra -

    6/3.2 = 1.875
    15 - 1.875 = 13.125
    13.125 + 7 = 20.125
    20.125 - 1 = 19.125


    Answer = 19.125

  • pre algebra -

    or, if as josiah interpreted, 3.2 = 3•2, then, since multiplication/division are done left-to-right, we have

    15-6/3.2+7-1
    15-2•2+7-1
    15-4+7-1
    17

    How important are parentheses!

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