Answer: 7
Step-by-step explanation:
1. for Shawna's score to be opposite to Tim's score Shawna must score 25 (since 25 is the absolute or "opposite" of -25)
2. Shawna already has 18 points, and she needs 25...
[tex]18 +x = 25[/tex]
now we can easily solve this problem!
[tex]25 - 18 = x[/tex]
[tex]x = 7[/tex]
:D
