book Maths Puzzle Numerical Ability

What is the area of s trapezoid with vertices(-3,-1), (3,3), (-1,3) and (3,-1)?
a.24 square units
b.20 square units
c16 square units
d.12 square units

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I am confused on how to go about this problem. Please help
t^4-t^3-14t^2+7t-4 divided by t-4 At noon, one ship sails north from Castaway Island at 15 knots and another ship sails east at 20 knots. How far apart will they be at 2:00 p.m.?