The total restaurant bill for food and drinks is = $63.57
This total bill consists of the prices of the items purchased, and the tip given to the waiter. So, the total bill of only food will contain only the food prices. So, it will be less than $63.57
Now, as it is not mentioned how much tip was given, lets assume that the tip is 10% which is $ 6.357
So, lets subtract it from the total bill. Its $ 57.22. Hence a good estimation is a reduced bill than the given amount of $63.57
You multiply two rational numbers by multiplying numerators and denominators with each other. So, you have
A rational number is a fraction where both numerator and denominator are integers. Since the product of two integers is an integer, the result fraction is also a rational number, because both 
and 
are integers.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
The conditional statement "If it is January, then it is winter in the United States," is converse of the conditional.
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