Answer:
x = 6, AM = 22
Step-by-step explanation:
Since A is the midpoint of RM, then RA = AM = 3x + 4 , then
RM = RA + AM , substitute values
7x + 2 = 3x + 4 + 3x + 4 = 6x + 8 ( subtract 6x from both sides )
x + 2 = 8 ( subtract 2 from both sides )
x = 6
Thus
AM = 3x + 4 = 3(6) + 4 = 18 + 4 = 22
