Need help with these 2 questions as soon as possible thank you​

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

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