The temperature at 5 A.M. was 8 degrees below zero Celsius. At 11 A.M. the temperature had increased by 13 degrees Celsius. What was the temperature at 11 A.M.?

Degrees Celsius

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity