15.5
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To convert 31 in base 10 to base 2, you need to repeatedly divide the number by 2 and keep track of the remainders. 31 divided by 2 is 15 with a remainder of 1, so the rightmost digit in base 2 is 1. 15 divided by 2 is 7 with a remainder of 1, so the next digit in base 2 is also 1. Continuing this process, you get 31 in base 10 is 11111 in base 2.
4.4
0.0062
14.4
20 and 18 can both be divided by 2 without remainders.