15 and 21. From 1 to 3 is plus 2 and from 3 to 6 is plus 3 and from 6 to 10 is plus 4 and so on
Answer:
-67-80v
Step-by-step explanation:
hope this helps!
Answer:
sonja has 6 books
Step-by-step explanation:
let m = amount of books sonja has
2m+m=18
combine like terms
3m=18
divide
m=6
