exam Maths Puzzle Numerical Ability

can you please help me: (((Graph the equation x-y=6)))

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exam Other Question

WHAT NUMBER RAISED TO THE FOURTH POWER EQUALS 625? EXPLAIN I've tried this one and I just can't get it, please help.

f(x) * h(x)=

if
f(x)= 7x-40
h(x)- -x^2 + 6x