Question

Given that log y= log(10xn), make n the subject

NOTE: n is the power

Answer 1

log y= log(10xn)
you claim n is the power.
Did you mean n is the exponent?
Did mean:
log y= log(10x^n) ?
in that case, "antilog" both sides
y = 10x^n
x^n = y/10
log both sides
log x^n = log(y/10)
n logx = logy - log10
n = (logy - 1)/logx

Answer 2

Thanks but I just can't understand anything from what uve done

Answer 3

I just used the fundamental rules of logarithm.

If you are studying logs, then you must know those.