number system

Which number system(s) are like the BASE 4 number system?

Convert 750 into base 11.

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Convert 836 into base 11.

Fill in the blank:  22810 = ___________ 3  (i.e. 228 in base 10 is equivalent to what number in base 3?)

What number is 2 after 2013 (i.e. 121 in base 3)?

What number is 3 before 2013 (i.e. 121 in base 3)?

What number is 2 before 1213 (i.e. 121 in base 3)?

Fill in the blank:  1223 = ___________ 10  (i.e. 122 in base 3 is equivalent to what number in base 10?)

In which base b does:  33b + 34b = 67b?

In which base b does:  23b + 23b = 50b?