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20-11-2014
Mathematics

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PLEASE HELP What is the solution to the sentence ''A number decreased by -5 is at least 7''?

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20-11-2014

n-5=7

add 5 to both sides

n=12

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20-11-2014

so a number degreased by -5 means a number +5 so
x-(-5)
is at least 7
x+5>7
so subtract 5 from both sides
x>2
the solution is any number more than, and including, 2

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