Question

On a cold January day, Michael noticed that the temperature dropped 21 degrees over the course of the day to -9 degrees Celsius. Find the temperature at the beginning of the day.

Answer 1

Answer:  The temperature at the beginning of the day is 30°C.

Step-by-step explanation:

Since we have given that  

Temperature dropped = 21°

It dropped by -9°C over the course of day.

So, the temperature at the beginning of the day is given by

$\text{temperature at the beginning}-9=21\\\\ 21^\circ C+9^\circ C\\\\=30^\circ C$

Hence, the temperature at the beginning of the day is 30°C.