exam Maths Puzzle Numerical Ability

An air sample 4.0 ppm (parts per million) of two pollutants. The concentration of one is four times the other. What are the concentrations?

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exam Other Question

Find the value of c that makes x^2+5x+c a perfect square trinomial.

Thanks for the help Based on your observation list out 4 points on the characteristics of logarithmic or exponential functions and their graphical representation.