exam Maths Puzzle Numerical Ability

if f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0

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exam Other Question

two-thirds of the diameter of a cirlce that is 9/16 across and 9/16? Graph the following systems:
3x - 6y = 9
x - 2y = 3

I am trying to figure out what I am doing wrong. Can someone get me on the right track. Thanks.