Book Maths Puzzle Algebra

find the zeros of the fuction
f(x)= x^3-x^2-21x+45

f(x)= x^4+4x^3+3x^2-4x-4

find all the real zeros of the function
f(x)= 5x^4+11x^3-48x^2-110x-20

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Book Other Question
An aircraft with a constant speed in still air travels 3000km with a constant tailwind in 3 hrs. With the same wind now against the aircraft, it takes 4 hours to make the return tr thequestion says that your percentage must be five times higher than the US percentage which is 20% and my percntage is 35% what formula do Iuse to determine how many times higeher