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C00002 00002	\centerline{\bf Assignment 9 for Lecture 13}
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\centerline{\bf Assignment 9 for Lecture 13}

Typeset the following.

\noindent
A better way to write $ x↑2 + y↑2 \over 2$ inside a sentence is $(x↑2 +
y↑2)/2$.

\medskip

\noindent
However, in display mode, it's OK to say $$ x = {k+1 \over k+2} $$ .

$$ {n \choose k} + {n \choose k+1} = {n+1 \choose k+1} $$

$$ \sum_{n=0}↑\infty{nx}↑2 $$


\noindent
How much wood could a wood chuck chuck if he could chuck three cords of
wood in $\int_{100}↑{250} 2x\,dx$ hours?

$$ \left(a↑2\over 2\right) + \left(b↑3 \over 3\right)$$

\noindent
The formula $\int_0↑{\infty}{{a+b\over c+d}+{{(\tan y}↑2)}↑5\over29}\,dy$
looks much better as a display:

$$ \int_0↑{\infty}{{a+b\over c+d}+{{(\tan y}↑2)}↑5\over29}\,dy $$

\bye