Without a calculator, how do you solve for z?
Given: 10^x = 2^y
Find z if: 5^x = 2^z
choices: 2^(x+y), 2^(y-x), 2^(y/x), or 2^(y+1)
Clearly z will be less than y, since 5^x is much less than 10^x... but beyond that I cannot go.
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