Can someone plz help me with this one problem

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

Melissa is purchasing a $160,000 home and her bank is offering her a 30-year mortgage at a 4.9% interest rate. in order to lower her monthly payment, melissa will make a 20% down payment and will purchase 3 points. what will her monthly mortgage payment be? a. $645.98 b. $650.46 c. $662.93 d. $606.69