To use the wireless network in the airport you must pay the daily fee unless you are a subscriber to the service. express your answer in terms of w: "you can use the wire- less network in the airport," d: "you pay the daily fee," and s: "you are a subscriber to the service."

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)