Explain why no part of the graph y = 10/x^2 appears below the x-axis?

a. the y-value is always negative
b. the y-value is always positive
c. the y-value is always zero
d. the y-value is always 10

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?