1-choose any two points on the line.
2-draw a right-angled triangle with the line as hypotenuse.
3-use the scale on each axis to find the triangle's: vertical length.horizontal length.
4-work out the vertical length ÷ horizontal length.
5-the result is the gradient of the line.
No. It is the other way around.
When you sell a product to another country, you are exporting your product. The country buying your product is the importer as they are bringing the product into the country by buying it.