The sum of x and y decreased by their product

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?

Cody ran nine miles on his first day of training. the next day he ran 1/8 that distance. how far did he run the second day?

Simplify the given expression leaving the answer in improper fraction form. 2/3+5/6