The product of 16 an the weight of the trout

Can someone me i’m confused. will give brainliest and a whole bunch of points

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

If a=0.333333 and b=0.55555, what is the value of a+b