Question

A cooling machine starts cooling the room at the rate of 5°C per hour. If the temperature of the
room is 28°C find the number of hours it takes to lower down the room temperature to -7° C.​

Answer 1

Answer:

A cooling machine starts cooling the room at the rate of 5°c per hour .

Let x be the Hours

The room temperature is 28°c.

28°c +7°c =35°c

5°c/ hour= 5x1 = 5°c

5 ×(X)= 35°c

X=35°C÷ 5

X=7 hours

The machine takes 7 hours to lower down the room temperature to -7°c.

Thank you