Some of them do, yes.
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-8x-5y-45 is not an equation. An equation requires an equal sign in there somewhere. If you meant -8x-5y=45, then there are many ways to rewrite it, such as -(8x+5y)=45, or 8x+5y=-45, or 8x=-(45+5y), to name three. If you meant -8x-5y=-45, then you're probably looking for 8x+5y=45.
The term "sideways" is one word, and it can be an adverb, when it modifies a verb to tell in what direction an action is made. It would be considered an adjective when used before a noun, e.g. sideways motion.
Trigonometry is used in CSI in calculating bullet or other projectile trajectories, ballistics, analyzing what actually happened in automobile collisions, how objects fall from heights, and in many many other ways.
After the pie chart has been created, select the chart and open the Chart menu. Pick the 3-D View option. In it you will find various ways of manipulating the pie chart, including rotating it.
If none of the letters were repeated, the answer would be 7!. However, the letters M & E are repeated. So, we need to divide the 7! by 2! twice to account for the two letters repeated twice. The solution is: 7! / (2! * 2!). This written out is: (7*6*5*4*3*2*1)/(2*1*2*1) or 1260.