How do you find perimeter​

Which graph shows a function with a range of all real numbers greater than or equal to -1

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]

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles