Can anyone help with question 1 and 2 it will be much appreciated.

The perimeter of a rhombus with a side of 6 is 24

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.  

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction