Asubmarine descended y meters. it was then 900 m below sea level if y = 200, how far below sea level was the submarine to start with?

700m

Explanation:

the equation is

went down y = 900

so it would be

200 - 900 = 700m

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation: