6/13=3/c what i the answer and show me how you got your answer. show me how you did it.

          6             3
             *    
        13              c

this is a proportion...so we cross multiply
(6)(c) = (3)(13)
6c = 39...divide both sides by 6
c = 39/6 which reduces to 13/2 or 6 1/2 <== ur answer

Dis the correct answer