exam Maths Puzzle Numerical Ability

Please help me understand these problems in chapter 6.1, starting with #15,page 380.
t^2-4/2t^3+11t^2-6t

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exam Other Question
Hello,

I would like to thank you all for your time, this is the last question I am having problems with.
Given cos(theta)=-0.4567 find the value(s) of theta, correct to the nearest degree, for 0

Solve and Graph:
4x=5y=-2 4y-x=11


and...


3x+y=2
-x-3y=6