0
Yes.
If you mean 5.7777 as a terminating decimal it is 57777/10000
If you mean 5.7777... as a recurring decimal where the 7 repeats forever it is 57/9
If a decimal number terminates or repeats one or more digits forever it is a rational number.
Otherwise if a decimal number goes on forever but does not repeat any digits (eg √2 = 1.41421356...) then it is an irrational number.
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Continue Learning about Basic Math
Is the product of a rational number and a rational number a rational number?
yes
Is a rational number multiplied a rational number rational?
Yes.
Is the number 17.5 a rational number?
yes
Which number can be multiplied to a rational number to explain that the product of two rational numbers is rational?
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Is 5 over 9 rational?
Yes. Any rational number divided by another rational number is also rational.
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