Answer:
Total amount needed is: $59.25
Explanation:
Given
See attachment for fence
Required
Cost of weedkiller needed
First, we need to calculate the height of the fence.
Considering the triangular end of the fence, we have:
--- Pythagoras theorem

Collect like terms
Take positive square root of both sides

Next, calculate the area of the fence (trapezium).
This is calculated as:

Where:


So, we have:




From the question, we have:

Let x = the cost required for the complete area
i.e.

So, we have:


Cross multiply

Divide both sides by




