pre algebra
posted by Taylor on .
what is the value of the expression?
156/3.2+71

I got 20 because you have to PEMDAS which is Parentheses Exponents Multiplacation Division Addition Subtraction. 156/3.2+71 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 = 211=20

6/3.2 = 1.875
15  1.875 = 13.125
13.125 + 7 = 20.125
20.125  1 = 19.125
Answer = 19.125 
or, if as josiah interpreted, 3.2 = 3•2, then, since multiplication/division are done lefttoright, we have
156/3.2+71
152•2+71
154+71
17
How important are parentheses!