## If $$x$$ and $$y$$ are positive integers and $$n = 5^x + 7^{y + 3},$$ what is the units digit of $$n?$$

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### If $$x$$ and $$y$$ are positive integers and $$n = 5^x + 7^{y + 3},$$ what is the units digit of $$n?$$

by VJesus12 » Tue Sep 22, 2020 7:14 am

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A

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If $$x$$ and $$y$$ are positive integers and $$n = 5^x + 7^{y + 3},$$ what is the units digit of $$n?$$

(1) $$y = 2x - 16$$
(2) $$y$$ is divisible by $$4.$$