Respuesta :
You have to figure this out my adding 9 points to how many points Mary has, to get how many points Alice has, with an answer of 30 points.
Answer:
30
Step-by-step explanation:
Let p equal the amount of the points Alice has.
Equation = 21 + 9 = 30
p = 30
Hope i helped!
-Snooky73hh