Three out of ten finalists will win a spelling bee. prizes will be given for first, second, and third place. how many different ways can the winners be selected? explain.

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