Whose side S1 is given by the cylinder x 2 + y2 = 9, whose bottom S2 is the disk x2 + y2 ≤ 9 in the plane z = 0, and whose top S3 is the part of the plane z = 3 + x that lies above S2. Sketch S first, indicate S1, S2, and S3 then evaluate.

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

english, cause i can’t you

in mathematics, a constraint is a condition of an optimization problem that the solution must satisfy. there are several types of constraints—primarily equality constraints, inequality constraints, and integer constraints. the set of candidate solutions that satisfy all constraints is called the feasible set.

hoped i'm right lol