For what values of x is the quantity x−9 negative?

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)