Easy math no scam links

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

How do i do this? i don’t understand

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.