Question

Find log (2/70/10)if log 7/10=a

Answer 1

log(2/70/10)= log(2/7) =log(2)-log(7). log(a/b)=log(a)-log(b). log(7/10)= log(7)-log(10)=log(7)-1=a => log(7)= 1+a. So log(2)-log(7)= log(2)-(1+a)=0.3010-1-a = -0.699-a. hence log(2/70/10)= -0.699- a . hope it helps you....