Between 6 a.m. and 10 a.m. the temperature rose by 5°F. Between 10 a.m. and 2 p.m. the temperature rose by 6°F. Between 2 p.m. and 6 p.m. the temperature rose by 0°C. Would you be able to tell how much the temperature rose since 6 a.m.? Why or why not?