exam Maths Puzzle Numerical Ability

A car dealer investigated the association between the number of TV commercials he ran each week and the number of cars he sold the following weekend. He found the correlation to be

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Find an equation of the secant line containing (1,f(1)) and (2,f(2)). 1)You drop a pebble into a calm pond causing ripples of concentric circles. The radius r(in feet) of the outer ripple is give by r(t)=0.6t where t is time (in seconds) after the pe