Answer:
We can use the concept of proportions to solve this problem. We know that the ratio of the height of the tree to the length of its shadow is the same as the ratio of the height of the mailbox to the length of its shadow.
Let's call the height of the mailbox "x". Then, we can set up the proportion:
height of tree / length of tree's shadow = height of mailbox / length of mailbox's shadow
Plugging in the values we know, we get:
36 / 18 = x / 4
Simplifying the left side of the equation, we get:
2 = x / 4
To solve for x, we can multiply both sides of the equation by 4:
8 = x
Therefore, the mailbox is 8 feet tall.
Explanation: