# A certain freezing process requires that room temperature be lowered from 40°C at the rate of 5°C every hour. What will be the room temperature 10 hours after the process begins?

In case if we have to lower a given integer by a certain value, we use the subtraction of integers.

## Answer: The room temperature 10 hours after lowering from 40°C at the rate of 5°C every hour is -10°C.

If we keep lowering the given temperature by 5°C every hour from the initial temperature of 40°C, the temperature will decrease every hour.

**Explanation:**

Since there is a decrease in temperature by 5°C every hour, let's first find the total decrease in 10 hours:

or, 10 × 5 = 50°C.

This means that after 10 hours, there is going to be a decrease in temperature by 50°C.

Since 'decrease' refers to the subtraction operation, let's find the total decrease in temperature from the initial temperature of 40°C as:

or, 40 - 50 = -10°C.