exam Maths Puzzle Numerical Ability

find the difference quotient of the following:

f(x) = 3x - x^2

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exam Other Question

Hi! I need some help solving this equation and if possible expressing my answer as on ordered pair.

y=2x+1
x+y=4

Thanks in advance for your help! Simplify

5(square root 6x) + 4(square root 6x)

Having trouble..thanks