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Is there a maximum limit on the number of elements that set Q can have?

Write a statement that represents the relationship between the following: and . 

Write the following as a base-ten numeral:

The sum of the digits of a 3-digit number is 18. The units digit is one less than the tens digit and the tens digit is one less than the hundreds.  What is the number?

Decide whether or not the set is closed under multiplication: {0, 1}

Determine what is wrong with the following calculation. 

Estimate by rounding each addend to the hundreds place:  

During his first year of college, John incurs the following expenses: $3000 on tuition, $1000 on books, $3600 on food, and $8000 on rent. If John earned $9000 during the year by working part-time, and the rest of the expenses were paid by his parents, how much did his parents pay?

A local television station sent out questionnaires to determine if viewers would rather see a documentary, an interview show, or reruns of a game show. There were 850 responses with the following results:  255 were interested in an interview show and a documentary, but not reruns; 34 were interested in an interview show and reruns but not a documentary; 119 were interested in reruns but not an interview show; 204 were interested in an interview show but not a documentary; 85 were interested in a documentary and reruns; 51 were interested in an interview show and reruns; 68 were interested in none of the three.  How many are interested in exactly one kind of show?

Convert the numeral to our number system.