exam Maths Puzzle Numerical Ability

if f(x)=x(x+1)(x-4), use interval notation to give all values of x where f(x)>0

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exam Other Question

Please help me solve this equation.
-2x = 8?
a.x = 4
b.2x = -8
c.3x + 5 = 6x - 17
d.3x + = 12x + 17
Thank you Each week a company can sell x units of itsproduct at a price of p each where p equals 600-5x. If it costthe company 8000-75x dollars to produce x units.

a) how many units shoul