exam Maths Puzzle Numerical Ability

help me please!!!!!This is for a test!!!!!


A bus company has 4000 passengers daily, each paying a fare of $2. For each $0.15 increase, the company estimates that it will lose

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exam Other Question
Find the approximate increasing and decreasing intervals:


a) f(x) = x2 - 4x
x (x - 4) =0
x = 4



b) f(x)= 9x -x3 (x to the third power) Line l is perpendicular to the graph of the equation -6x - 5y = 30 and contains the point (2, -5). Find the equation for l.
y =