If I have 1692 coins in a jar that equals 100.52 cents in a jar what are numbers of coin in each jar ?

How to do this , and can some one explain

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 equivalent fraction for the following fraction using 5 as the multiplier? 1/2