exam Maths Puzzle Numerical Ability

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X^2+9X+20=0 by factoring

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The formula b(t) = 1.353(1.9025)^t represents the number of broadband internet users (in millions) where t if the time in years measured from 1998. How many broadband users (to the nearest million) does this formula predict for 2004? Kerry has a cordless telephone receiver that can operate within a range of 1,000 feet from the telephone's base. Kerry takes the receiver from the base and walks 800 feet due north