When it comes to fractions yes you do. But to make it easier just multiply the denominators and that should give u a common denominator, they don't always have to be least common.
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Step-by-step explanation:
-0.75 is a rational number because it can be expressed as the fraction -3/4 and it is an integer
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I think 2600 passwords are possible
It is B. the differences are added together
