A scientific notation includes c x 10^n. c is a number between 1-9, and n is the nth power of 10.
If we move the decimal in 0.3 to the right by 1 place, we can get "c", which will be 3. Since we have moved the decimal to the right, each place moved right counts as -1 for n.
When a point lies on the x-axis, its y- coordinate is 0. The same is true for the reverse. So if your point lies on the y-axis, its x coordinate will be 0.