does anybody know this?? please it would help a lot
 
											 
											Answer:
A
Step-by-step explanation:
DG + GM = DM , substitute values
r + 3 + 4r - 28 = 25 , that is
5r - 25 = 25 ( add 25 to both sides )
5r = 50 ( divide both sides by 5 )
r = 10 → A