Help with math assignment 2

How do you find the area of a triangle

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?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?