In dry air, the temperature decreases by about 0.65 °c for each 100-m increase in altitude.

a) the temperature in red deer, alberta is 10 degrees celsius on a dry day. what is the temperature outside an aircraft 2.8km above the city?

b) the temperature outside an aircraft is 1600 meters above red deer is -8.5 degrees celsius what is the temperature in this city?

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?