If 18 is subtracted from twice the square of an integer, the result is equal to nine times the integer. Find the integer.
[Only an algebraic solution will be accepted.]

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /