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.

x = 12

y = 15

step-by-step explanation:

1. 3

2. 4

3. 1

hope this ! have a great day.

-wfz