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When the base-16 number $66666_{16}$ is written in base 2, how many base-2 digits (bits) does it hav...

$x^{2}+1\ >\ 4$

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Mark has 5 apples. Lily has 4 apples. Tom has twice more apples then Mark and Lily together. How man...

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What is $\frac{1357_{9}}{100_{4}}-2460_{8}+5678_{9}$? Express your answer in base 10.

We roll a fair 6-sided die 5 times. What is the probability that we get a 6 in at most 2 of the roll...

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$\frac{x}{23}+\sqrt{x}+4=0$