Which statement can be used or show that these expressions are equivalent?

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?

What is the equation for the line that passes through the points (-6,4) and (-2,9) answer in point slope form

By what fraction name for 1 must 2/3 be multiplied to form a fraction with a denominator of 15