exam Maths Puzzle Numerical Ability

Do you know if my TI-83 is capable of plotting three-dimentional triples and if so how do you plot (2,-4,-6) the order of buttons to push.

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exam Other Question

21: Refer to triangle DEF in Figure 5, if m Ang D = 30o, m Ang E = 60o, and DF = 12, what is ME in simplest form? I am not sure where to begin or end with this problem! HELP would be greatly appreciated!
2 over /(radical sign)2
Thanks~
ac