Question 633461
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
  R___________S______________T

if RT=21 AND ST=8, calculate RS = 13
 IF RS=17 AND ST=34,calculate RT = 51
 If RT=25 RS=x+8 and ST=3X+5, calculate ST  
      25-(x+8)= 3x+5
           12 = 4x, 
              x =3  and ST = 3x+5 = 14 
 IF S is the midpoint of line RT, RS=5X+4 AND ST=3X+6 calculate RT
               5x + 4 = 3x+ 6
                   2x = 2
                    x = 1 and  5x+4+3x+6 = 18