exam Maths Puzzle Numerical Ability

4) Consider the function f (x) = x^ + 4x + 1

a) Find h, the x-coordinate of the vertex of this parabola.
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exam Other Question

How long will it take a sample of radioactive substance to decay to half of its original amount, if it decays according to the function A(t)=450e^.216t, where t is the time in years? Round your answer to the nearest hundredth year. If [number] =5. What are the possible values of the number?