I need help with those 3 questions plz

Apackage of bacon holds 15 strips of bacon. the pancake house uses 17 packages of bacon in the morning and 21 packages in the afternoon. how many more strips were used in the afternoon than the morning?

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u