Answer:
Shakira bowled 4 games.
Explanation:
If Shakira paid $3 for rent, we can subtract 3 from 21.
21-3=18.
Now, find out how much 4.50 can go into 18.
First, multiply 4.50 by 2.
4.50x2=9
Now, Since 2 games is $9, multiply 9 by 2.
9x2=18
Now that we found out that 9x2=18, we can see that Shakira bowled 4 games.
Hope this helps! :D