Answer:
1010 base 9 Changing from base to decimal we start from left side digit and multiply by base
1000 * 9^3 = 729
1 * 9 = 9
We sum and get 738
85 base 9 =
8 * 9 = 72
5 = 5
We sum 72 + 5 = 77 decimal
738 - 77 = 661 decimal
and if the answer must be in base 9 then:
661 decimal = 814 base 9
Explanation: