We assume: 1. this probrem is asking how to convert 4A in base-12 number into base-10 number using powers of 12, and 2. A of 4A is equal to 10 in base-10.
Each place in a base-12 represents a power of 12 like 1234 (base-10)=1x10³+2X10²+3x10¹+4x10º, or 1101(base-2)=1x2³+1x2²+0x2¹+1x2º (base-10)=8+4+0+1=13(10).
So, 4A(12)=4x12¹+10x12º=48+10=58(10)
The answer is: 4A in base-12 equals 58 in base-10.