exam Maths Puzzle Numerical Ability

simplify 3(a+b)+15-a+2b=

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exam Other Question

f(x)=-x^+4x-3

Graph y=f(x)

Show x-and y-intercepts and vertex on the graph

I actually thought y was f(x) from how it was explained in class, where am I off on this? What would be the radius of a circle with a diameter of 8 inches?