The quantity y varies directly with the square of xand inversely with z when x is 9 and zis 27 y's 6. what is the constant of vanation?

Ineed if you could explain and give me the answer you! this needs done

Wrote and expression for the difference of p and 4

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out