book Maths Puzzle Numerical Ability

I am confused on how to go about this problem. Please help
t^4-t^3-14t^2+7t-4 divided by t-4

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book Other Question

What is the x-intercept of 8x/3+5-2y=0 ? 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