Briggs New YorkWomen's Plus Size Pull on Dress Pant Average & Short Length

These list sizes 20 22 24 but no W. Are these plus size or not?

Can you put them in the dryer?

What's the difference between 24Plus and 24W

Since length of 18w is an unknown, can someone tell me the width of the hem? my normal length is 31 and i know i will have to let out the hem.