Answer: 5.966 feet
Step-by-step explanation: To find the depth of the river in 1848, we can start by calculating the depth of the river in 1847 after the 16% drop.
16% of 6.7 feet is 0.16 x 6.7 = 1.072 feet.
So the depth of the river in 1847 was 6.7 - 1.072 = 5.628 feet.
Next, we can calculate the depth of the river in 1848 after the 6% rise.
6% of 5.628 feet is 0.06 x 5.628 = 0.338 feet.
So the depth of the river in 1848 was 5.628 + 0.338 = 5.966 feet.
Therefore, the depth of the river in 1848 was approximately 5.966 feet.