Equation of a cosecant graph with the points (1 pi/12, 5) (13 pi/12, 5)

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 is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

Icould really use some with this question.