exam Maths Puzzle Numerical Ability

Please help me solve this:

Find the zeros of the following functions.

f(x) = 4x^3-4x^2-7x-2

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exam Other Question

Which of the ordered pairs
(7, 1), (10, 0), (1, -3), (-8, 6)
are solutions for the equation x + 3y = 10? what is 1 5/8 in a decimal form