book Maths Puzzle Numerical Ability

y= - 3x -1 how do you do this?

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book Other Question

For 2000 patients, blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting times between 5 and 11 seconds?

Thanks How do you factor this expression 4x^2+12x+9?