exam Maths Puzzle Numerical Ability

graph the functions.
f (x)=2x - 5

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exam Other Question

please help me to answer this question, the directions are:
determine the intervals of increasing and decreasing.

f(x)=-2x^3-3x^2+12 okay i am having problems solving this one its easy i know i must be missing a step -[3x-(2x+5)=-4[3(2x-4)]-3x