The ratio of two numbers is 5/6. the second number is 16 less than twice the first number. find both numbers

How can you decide witch operations to use to slice a two step equation

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

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?