What is the perimeter of an equilatral triangle with one side 4x - 8

Write the sentence as an equation. 6 fewer than the quantity 140 times j equals 104

The lengths of two sides of a right triangle are given. find the length of the third side. round to the nearest tenth if necessary. a) y = 12/5x + 39/5 b) y = 5/12x + 5/39 c) y = 12/5x - 39/5 d) y = 5/12x - 5/39

This is about circle theorems. someone asap : (