Quando o ângulo de elevação do sol e de 70 a sombra de um edifício medes 20 cm calcule a altura do edifício dados : sen 70=0,93 cos 70=0,3 e tg70=2,74?

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,