exam Maths Puzzle Numerical Ability

(x-1)^2=7

x^2-9x-4=6

4x^2-8x=3=5

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exam Other Question

Please find dy/dx using implicit differentiation:

y^2+e^y=ln x^2+4

Thanks! A long-distance phone call costs $1.28 for the first minute and $0.78 for each additional minute or portion thereof. Write an inequality representing the number of minutes a person could talk without exceeding $8.