Un tubo angosto uniforme de 1,8 m de longitud está abierto en ambos extremos, resonando a dos frecuencias sucesivas de 380 Hz y 456 Hz. La velocidad del sonido en el gas del interior del tubo es de aproximadamente, en m/s

i dont know i just need points

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

x = 3 ± √(5+y)

hello,

as   long as they add up to 180 its correct.