book Maths Puzzle Numerical Ability

which of the numbers 51,81,and 111 is a composite number?

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book Other Question

my brother actually needed help on this one, I forgot all of my Algebra I work. the problem was x^3 and the choices were a) x=2 b) x=5 and c) x=-3

I dont get it at all to explain it to him! help! thanks sooo much!

-Emily {{{ (1/2) x + (3/4) y = 6 }}}