The temperature in Greenland on a sunny day rises 19°C from its minimum temperature to a maximum of -4°C. What was the minimum temperature on the day?
If the maximum temperature is -4°C and the increase is 19°C, then the minimum temperature can be found by subtracting the increase from the maximum temperature:
Minimum temperature = Maximum temperature - Increase
Minimum temperature = -4°C - 19°C
Minimum temperature = -23°C
Therefore, the minimum temperature on the sunny day in Greenland was -23°C.