Determine whether T(1,-4), U(-3,-20), and V(5,12) can be the coordinates of the vertices of a triangle. (hint: check by altitude)

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]

Me. i can't figure out this question. give an explanation too. .

Identify the number as a rational or irrational.explain. 127