For 14/28 is simplest form would be 1/2 and 8/28 in simplest form would be 2/7. I hope this helps. ^^
Root both sides of the equation
x+3= plus or minus root 7
Subtract 3 from both sides.
0.1 decrease in 15 minutes
unit rate is 0.1 / 15 = 0.00667
Temperature is decreasing by 0.00667 degrees Celsius per minute