1. Substitute and simplify

1. If \(a\) \(=\) −1, then find the value of 5\(-a\):
 
2. If \(b\) \(=\) 18, then find the value of 7 \(+\) \(b\):
Login or Fast registration
Previous theory
Exit to the topic
Next task
Copyright © 2026 YaClass Tech Private Limited Contacts Terms and Conditions Privacy Policy