exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve by the elimination method.
0.3x - 0.2y = 4
0.5x + 0.5y = -45/17

What is the solution of the system?
help please if i have equ:

k = m + s + x + y + z
how do i solve for s?

s = ?

All you can do is get s by itself on one side of the equal sign. In this case, subtract the other terms.
s = k - m - x - y - z