exam Maths Puzzle Numerical Ability

I really need help with this question: find the roots of the polynomial equation, and state the multiplicity of each root P(x)=-1/2(x+3)(x+4)^3(2x+1)

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exam Other Question

Translate the following problems into algebraic equations :

1) 42 is 40% of what number?

2) 15 is what percent of 3?

3) The sum of the page numbers on facing pages of a book is 157; what are the page numbers?
Debbie traveled by boat 4 miles upstream to fish in her favorite spot. Because of the 5-mph current, it took her 40 minutes longer to get there than to return. How fast will her boat go in still water? (Round the answer to one decimal place.)