Answer:
Kiersten height is 6 feet
Length of her shadow is 9 feet
Length of the shadow of the tree is 84 feet
Therefore, the height of the tree is
[tex] \frac{6}{9} = \frac{x}{84} \\ x = \frac{6 \times 84}{9} \\ \boxed{x = 56}[/tex]
★D. The tree is 56 feet tall.
