Finding all the zeroes of a polynomial factor and please explain

1) f(x) =x^4-9x^3+32x^2-10x-52

2) f(x)=4x^5-48x^4+169x^3-157x^2-309x- 91

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For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2