Boy who wants numbers to talk and chill if not enjoy the free bainlys

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Find the perimeter of the triangle with vertices  d(3, 4),  e(8, 7), and  f(5, 9). do not round before calculating the perimeter. after calculating the perimeter, round your answer to the nearest tenth.  

What is the inverse of f(x) = 6x -24