Respuesta :

7thdumbgrader
m = 88
s = 10
r = 5
for the first question all you need to do is do the opposite of subtracting which is adding so add 13 to both sides and so 75 plus 13 is 88. 

Answer:

m=88,s=10,and r=5

Step-by-step explanation: the first question +13 another one -8     and /10