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We're not magic; we can't see the number line.
3
point a.
Yes, usually. The lines are simply shown to illustrate direction and strength of the field.
This is already an acceptable number. It could be shown with a decimal point and would therefore be followed by a zero. 2200 = 2200.0
strength, the number of lines represents how strong the magnet is, this is also sometimes shown by the thickness of the lines.
Altitude is height above the ground. Latitude and Longitude are map coordinates. Lines of Latitude are the horizontal lines shown running east-to-west on maps and locate your position on the globe in the North-South direction.
Contor lines depict the gradient/height of hills. They usually have these shown on maps with a little orange number along the contor itself.
Hidden lines.
We're not magic; we can't see the number line.
A+
5
There is no number shown.
It means round the number so that fewer digits after the decimal point are shown.
A depression is shown by contour lines with small marks pointing toward the lowest point of the depression.
countour intervals
grid lines of longitude and latitude