exam Maths Puzzle Numerical Ability

If f(x)=2x+5 and g(x)=3x2-1 find the value of f(b2)

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exam Other Question

Convert each rate using dimensional analysis

2.5 qt/min=___gal/h
-20-3x+3x^2=0

I know that the trinomial cannot be factored, but is there another way to solve the equation?