1. Write clear sentences explaining how you can tell:
   1. Whether it is possible to multiply two matrices together.
   2. What the size of the resulting matrix will be.
2. Solve the following system of equations (find the intersection of the two lines):

$$ \begin{eqnarray} 2x + 3y & = & 7 \\ -2x - 5y & = & 11 \end{eqnarray} $$

3. Using ...

1. Solve for x:
   1. $ 3x + 5 = 14 $
   2. $ 5x - 2 = 13 $
   3. $ 10 + 6x = 5 $
   4. $ 9 = -3x + 6 $
2. A runner starts running at noon exactly, going 10 miles per hour. At 12:30 pm, a bicycle starts chasing the runner, going 12 miles per hour.
   1. Make a careful graph showing the positions of ...

1. The following two equations describe the height of a missile above (or below) the surface of the ocean, when it is launched from a submarine:

1. $ y = -t^2 + 12t - 20 $
2. $ y = -5t^2 + 30t - 20$

2. After how many seconds will each missile break through the surface of the water?
3. After ...

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