4. A scientist changes the temperature of a solution at a rate of - 7°C per minute. How many minutes will it take for

the solution's temperature to change from 0°C to - 49°C?

7 minutes

Step-by-step explanation:

The scientist changes the temperature for the solution at a rate of - 7°C per minute. We need to find out how long it'll take for the solution's temperature to change from 0°C to - 49°C. So, we divide - 7 by - 49 to find out how long it will take:

-49 / - 7 = 7

It will take 7 minutes for the temperature to reach - 49°C.