exam Maths Puzzle Numerical Ability

Help please:

Divide--

p^2 - q^2/p+q divided by p-q/p+q

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exam Other Question

Which of these is not an expression:
z^y-6
y(z+5)
z+y+1
y + divided by z i KNOW THAT THIS IS PROBABLY A SIMPLY ONE BUT iM HAVING A TIME TRYING TO FIGURE HOW TO GET THE CORRECT ANSWER. DMVT math student.

SOLVE FOR B: AX+BY=C. how do you get an answer from this?