Solve for n: 4^n×2^-18=1

One way to do it is by cleverly rewriting terms and using some basic algebraic identities:

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Another way would be to use logarithms, namely:

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Hope this helps.

n = 9.

Step-by-step explanation:

4^n = 1 / 2^-18

4^n = 2^18

2^2n = 2^18

2n = 18

n = 9.

$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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