exam Maths Puzzle Numerical Ability

How do yu solve this by using quadratic formula 2 = 0.7n + 0.6n2?
please show steps.

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exam Other Question

A researcher polled 260 students at a university and found that 83 of them owned a laptop computer. Estimate the probability that a randomly selected college student owns a laptop computer. find the slope of a line parallel to the line -x = 2y + 5