Find the slope please using the formula

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.  

Aphrase is shown read the phrase and give me the answer

Find the distance between the point (-3,-4), and (see the picture below)