Question

A freezer cools at a rate of 8°C per hour. If the temperature inside the freezer is 9°C now, what will its temperature be after 8 hours?

Answer 1

Answer:

-55

Step-by-step explanation:

The temperature after 5 hours will be 12−5×4or12+5×(−4).

Answer 2

Given:

A freezer cools at a rate of 8°C per hour

temperature inside the freezer is 9°C

Find temperature after 8 hours

• there is a decrease in temperature by 8°C every hour, let's first find the total decrease in 8 hours:

       8 × 8 = 64°C

This means that after 8 hours, decrease in temperature by 64°C.

• Since 'decrease' refers to the subtraction operation, let's find the total decrease in temperature from the initial temperature of 9°C as:

        9 -  64 = -55°C

Hence the temperature be after 8 hours is -55°C