Ted has a shelf that is 75 over 4 inches wide. How many books can Ted arrange on the shelf if each book is 5 over 4 inches thick
2 answers:
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first, consider that 25 = 5^2, and -25 = -1*25 = -1*5^2.
Then, you can write:
because i = √-1.
Hence, the answer is 5i