Answer:

Step-by-step explanation:
Given
See attachment for graph
Required
The unit cost
Pick any point on the dots of the graph; we have:

The unit cost is then calculated as:


Surface area is:
6*8=48
12*10=120
8*12=96
6*12=72
48+72+120+96 = 336
The surface area is 336 square km
The answer for A is 2,026. I set a porportion up which is 77/x = 3.8/100
The answer to B is 26
Answer:
it is possible to draw a triangle with angles 90 degree, 60degree and again 60 degree