Answer:
use a calculator
Step-by-step explanation:
The answer could be 27 for the first 3 and 8 for the last one
142 in base 5 means 1(52) + 4(51) + 2(50) = 25 + 20 + 2 = 47
11011 in base 2 means 1(24) + 1(23) + 0(22) + 1(21) + 1(20) = 27
39T in base 12 means 3(122) + 9(121) + 10(120) = 550
Answer:
-13
Step-by-step explanation: