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Shown below is a problem Margaret solved and the steps she used to solve it. Margaret has entered this problem incorrectly. What misunderstandings does Margaret have? Show your work.

1/2 (64 + 5) - 0.2 (-20 +10)
1/2 (69) - 6
34.5 - 6
28.5


(paper due on 11/5/18

User Eric Jin
by
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1 Answer

3 votes

She has distributed the bracket incorrectly


(1)/(2)(64 + 5) - 0.2(- 20 + 10)

=
(1)/(2)(69) - 0.2 (- 10)

=34.5 + 2

= 36.5



User Elfayer
by
7.4k points