exam Maths Puzzle Numerical Ability

Solve by using the quadratic formula. x^2 + 5x � 14 = 0

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exam Other Question

Find the constant of variation k.
m varies directly with n; m=144 when n=8.
This is what I have; m=kn (144)=k8 k=18
Am I close on this at least a little? Thank you for your help.

Barb Neely help solving -11=x+(-10)