A submarine is only allowed to change its depth by rising toward the surface in 50-meter stages. It starts off at -235 meters. How many stages will it take to return to the surface?

i am sure it will be 90 degrees.

step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this

3x + 4y -25 =0 represents the amount of change sianna should recieve