As part of an experiment, a student combined 3.4g of one chemical with 0.56 g of a second chemical. He then recorded the combined mass as 4 g. Did the student record the combined mass correctly? Explain.

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

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?