So scary! A dissappointment! Is Kim a blonde, dislexic, illiterate tho t or something?

Which is an equation for the nth terms of the sequence 12,15,18,21

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.