Final answer:
The correct calculation for the temperature change from +5°C to -3°C is (-3°C) - (+5°C), resulting in a change of -8°C.
Step-by-step explanation:
The question is asking how to calculate the temperature change from +5°C to -3°C. The correct calculation to determine the temperature change would be to subtract the evening temperature from the midday temperature, which is (-3°C) - (+5°C), resulting in a temperature change of -8°C. This shows that the temperature has decreased by 8 degrees Celsius.
The incorrect calculations provided are: 5-3, which represents a subtraction of positive numbers and not temperatures; (-5)-3, which also does not reflect the temperatures in question; and (-5) + 3, which would be adding a negative number and a positive number, not representing the temperature change scenario described.