Answer: 410 square km
Step-by-step explanation:
The area of each of the triangles with their base on the 10 km side is , so their combined area is
.
The area of each of the triangles with their base on the 12 km side is , so their combined area is
.
The area of the bottom rectangular face is .
So, the total surface area is
For a y-intercept, set in your equation. Remember that a y-intercept intercepts the y-axis, which is found at
. Thus, setting
will give you the place where your equation intercepts the y-axis.
For an x-intercept, do the opposite, set . This is because the x-axis is found at
. Similar to the y-intercept, this will find you the point where your equation intercepts the x-axis.