exam Maths Puzzle Numerical Ability

If f(x)=x(x+3)(x-1), use interval notation to give all values of x where f(x)>0.

If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0.

Find the q

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exam Other Question

100=20-5r

please solve.

100=20-5r
-20 -20
_______
80=-5r
answer: -16=r

k^2=10