Find that Number!

15 Points Per Correct Answer - No time limit  

1. A natural number is doubled when added to its reciprocal. Find that number! 2 1/2 0 1

2. The logarithm (base ten) of five hundred times an integer is three. Find that number! 2 1500 450 8

3. A natural number is halved when reduced by thirteen. Find that number! Answer: (A number)

4. Twice a negative integer is eight less than its square. Find that number! 16 8 -2 -64

5. A positive integer is equal to 4 times its reciprocal. Find that number! -4 2 3 9

6. The sum of the square of a negative integer and itself is zero. Find that number! 0 -1/2 -2 -1

7. The product of a positive integer and the integer that succeeds it is twelve. Find that number! 3 26 5 27

8. The digit in the units place of a two-digit number exceeds that in the tens place by one. If the number is equal to four times the sum of its digits, find that number! Answer: (A two-digit number)

9. A number added to twice itself gives twenty-one. Find that number! Answer: (A number)

10. The fourth power of a positive integer is equal to four times its square. Find that number! 4 0 2 1