Question

5. A certain freezing process requires the room temperature lowered from 42 °C at the rate of 4 °C every hour. What will be the room temperature 15 hours after the process begins ?​

Answer 1

Answer:

The present room temperature = 40\degree C40°C

The room temperature decreasing every hour by rate of = 5\degree C5°C

The room temperature after 10 hours will be

= 40\degree C\ +\ 10\times\left(-5\degree C\right)40°C + 10×(−5°C)

= 40\degree C-50\degree C\40°C−50°C 

= -10\degree C−10°C

so, the room temperature after 10 hour = -10\degree C−10°C

Answer 2

Answer:

-18°c

Step-by-step explanation:

1 hour 4°

so, in 15 hour= 15*4= 60

hence, 42-60= -18°