# 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

• 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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