if |x|=a and a is any positive number.why are there 2 posible values of x?

why are there 2 posible values of x?
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2 Answers

abs(-a)=abs(+a)=abs(a)=a
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If an object's mass is 70 q, and its volume is 10cm cubed, what is its density? Select one: a. 700 g/cubic cm b. 60 g/cubic cm c. 7g/cubic cm
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