Q: Write Context$-$free grammars describes the syntax of any expression that has the form: $G=$ any digits separated by $+$ or $-$ signs $>$

Q: Using the grammar you have written above, use the left side derivation to the following string

$3+6-9$

Q: Using the grammar you have written above, draw right and left$-$associative parse trees for the following string

$3+6-9$