Find the missing side or angle for each variable round your answer to the nearest tenth

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

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?