Types of Numbers
SAT Subject Test in Math II · Learn by Concept
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SAT Subject Test in Math II › Types of Numbers
Express 73 as a binary (base two) number.
Explanation
73 can be uniquely expressed as the sum of distinct powers of two as follows:
Therefore, there is a "1" in the seventh, fourth, and first positions from the right, and a "0" everywhere else. So,
Which of the following numbers is an imaginary number?
Explanation
By definition, an imaginary number is a number with the term "i" in it. For this problem 7i is the only answer with the imaginary part.
Express 
Explanation
Place values in the base two system are powers of two rather than powers of ten.
Express 68 as a base two (binary) number.
Explanation
68 can be expressed as the sum of distinct powers of two as follows:
Therefore, there are 1's in the seventh and third place from the right, and 0's everywhere else, so
