exam Maths Puzzle Numerical Ability

The number of mosquitoes M(x), in millions, in a certain area depends on the June rainfall x, in inches: M(x)=19x-x^2. What rainfall produces the maximum number of mosquitoes? Hint: Find the maximum of the parabola.

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exam Other Question
Write the equation of the line passing through each of the given points with the indicated slope. Give your results in slope-intercept form, where possible. Points: (0,5), m=-3/5 a) 4*12-2/3
b) 3+10/3-1*2
c) (3+4)*3-6/9
d) 7x-11y=1
e) 4x+5y=12