The answer is B.24x^6-18x^5=6x^5(4x-3)
The perimeter is twice the sum of the length and the width:

The area is the product of the dimensions:

So, the system is

4,000×0.035×2=280
.................
The longer an object, the longer the shadow they cast at a given time of the day and vice versa. This is called direct proportionality. At the same time,
If 15 foot flagpole ---- casts 11 foot shandow
28 foot tree -------- casts ?? foot shadow
The proportion would therefore be:
Length of shadow cast by tree = (28/15)*11 = 20.533 foot.