Question

The temperature is changing every day by -7/18 degrees Fahrenheit. What will be the change in the temperature after 3 days?

Answer 1

multiply -7/18 x 3 days

 -7/18 x 3/1 = -21/18 = -1 3/18 = -1 1/6 change

Answer 2

Let the temperature today be x °F.

Change in temperature after 1 day = $(x - \frac{7}{18} )$ °F

Change in temperature  after 2 days = $(x - \frac{7}{18} ) - \frac{7}{18} = (x - 2*\frac{7}{18} )$ °F

Change in temperature after 3 days
= $(x - 2*\frac{7}{18} ) - \frac{7}{18} = (x - 3*\frac{7}{18} )=(x - \frac{7}{6} )$°F