exam Maths Puzzle Numerical Ability

LIST ALL POSSIBLE ZERO
f(x)= X^3-27X-54

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exam Other Question

i need help on 7x-3y+3z-2 and i need to show my work I HAVE $1.00 IN MY POCKET IT IS ALL IN COINS.
TOTAL COINS IS 50.
I HAVE 50 COINS IN MY POCKET WHICH IS EQUAL TO $1.00. WHAT IS THE BREAK DOWN OF COINS THAT I HAVE? HOW MANY OF EACH ?