5x + 4x + 1
= 9x + 1
u just need to simplify the answer
We need to find the maximum (Vertex of the function)
Let:
L = Length = 1500 - 2x
W = Width = x
The area is given by:

We can find the maximum using the following formula:

Evaluate the area for the value we found previously:

The largest area that can be enclosed is 281250m²
An exponential growth model has the form:

we know that the initial population was 3000 and that after seven years the population was 3525, plugging this vales and solving for the unknown we have:

Therefore the missing part of the function is 0.083
If you want the height of the crate it's volume / base area = 48/16 = 3 feet.