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Verified Answer :

I am assuming A is base 5 based on the ve

a. 15^3 + 35^2 + 15^1+ 25^0
125+75+5+2

a = 207

b. 2+4+16+32+128+256

b = 438

(please note that a binary number having 9 digits is highly unusual. most are normally 8 which makes up a bit)