A=2b, trinomial that represents c when a= x^2 - 2x +3 and b=2x^2 +1

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?

Which function has an inverse function? a. f(x)= |x+3|/5 b. f(x)= x^5-3 c. f(x)= x^4/7+27 d. f(x)= 1/x²

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.