5.) The temperature at 10 PM was 2.7 C. midnight, the temperature started dropp "C per hour. What was the temperature

1. An ambulance is called to the scene of an accident 4 kilometres away from the ambulance station. The distance, in kilometres, that the ambulance has traveled to the scene, t seconds after leaving the station, is given in the following table: Time (s) Distance (km) 0 0.5 a. Over which 30-second interval(s) did the ambulance travel the fastest? b. Over which 30-second interval(s) did the ambulance travel the slowest? c. Determine the average speed of the ambulance, in kilometres per hour, over its entire trip to the accident. 0 30 60 1.5 90 1.75 120 2.75 150 3.25 180 4.0

10. A cup of coffee has temperature 80°C in a room kept at 20°C. After 30 minutes, the coffee cools to 60°C. What is the temperature of the coffee after another half hour?

The U.S. Weather Bureau has a station on Mauna Loa in Hawaii that has measured carbon dioxide levels since 1959. At that time, there were 313 parts per million of carbon dioxide in the atmosphere. In 2005, the figure was 383 parts per million. What is the absolute change in carbon dioxide levels: parts per million What is the relative change in carbon dioxide levels: between 0 and 100, not a decimal between 0 and 1. Round to ONE decimal place.) % (Give your answer as a percent