To calculate the density of goldfish in the tank, we use the formula for density:
\[ \text{Density} = \frac{\text{Number of goldfish}}{\text{Volume of the tank}} \]
Given:
- Number of goldfish = 22
- Volume of the tank = 56 cubic feet
Substituting the values into the formula:
\[ \text{Density} = \frac{22 \text{ goldfish}}{56 \text{ cubic feet}} \approx 0.392857 \text{ goldfish per cubic foot} \]
Rounding to two decimal places, this is approximately:
\[ 0.39 \text{ goldfish per cubic foot} \]
Thus, the answer is:
0.39 goldfish per cubic foot.