Cookies have to be in the open between 8 and 12 minutes and brownies have to be in the oven for 9 and 14 minutes. Which of the following represents all times t, when both are in the oven at the same time?

Beth makes batches of bluberry muffins and banna muffins. each batchis 6 muffins. she makes 2.5 batches of bluberry muffins. how many batches of bananna muffins should beth make if she wants to have a total of 60 muffins?

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?

2x minus y equals 6, x plus y equals negative 3