exam Maths Puzzle Numerical Ability

Permuation n! / (n-r)! or Combination n! / (n-r)! r!

Using one of the above can you help me solve:

A tv/stereo store has 12 differrent big-screen tv's and 8 stereo syste

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exam Other Question

(2t^2+t)^2-4(2t^2+t)+3=0 okay. today my teacher went over this, but I still do not understand it. She said to do something like a scale in science "whatever you do to this side, do to the other." but i still dont get it. HELP!!!