PLEASE HELP IF POSSIBLE :)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50