book Maths Puzzle Numerical Ability

How to find the value when x^4 - 4x^3 + 16x - 16 and x=5/2?

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book Other Question

rewrite the equation in function form:

-x +y = 6 400 people were surveyed before a vote for a referendum. 300 of the 400 said yes.expess this as an equivalent ratio in simplest form.