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The interior angle of an \(2n-\)gon is \( 30 ^ \circ \) more than the interior angle of a \(n-\)gon.

What is \(n\)?

\[\large \frac{(1+2+3+\cdots+10) - 12 \times 3 + 1 }{2} = x\] What is \(x\)?

Today was Jerylin's birthday. She had 18 marbles. She plans to give marbles, at least one, to each of her friends. But Belinda rejected her offer and even gave ...

Let \(\displaystyle c = \sum_{r=1}^{2016} r \) and \(\displaystyle d = \sum_{r=1}^{2015} r \). Find the average of \(c\) and \(d\).

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