exam Maths Puzzle Numerical Ability

I got this wrong on my last quiz and I just want to check with someone else to see if I am losing my mind. Graph the function f(x)=int(x)

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exam Other Question

x^3-4x <= 0 Alexis draws 300 circles with diameter 1, Brianna draws 400 squares with side length 1, and Cyril draws 500 equilateral triangles with side length 1. If they all draw with the same type of pen, who uses the most ink?