Explanation
From the statement, we know that stack of 30 science flashcards has:
• 10 with insects,
,
• 8 with trees,
,
• 8 with flowers,
,
• 4 with birds.
The probability of selecting a tree or a flower is given by:
[tex]P(\text{tree or flower})=\frac{\text{\# of trees + \# of flowers}}{\text{total \# of cards}}=\frac{8+8}{30}=\frac{16}{30}=\frac{4}{15}.[/tex]Answer
4/15
