¿Cuáles son las propiedades de la suma de números racionales

Step-by-step explanation:

The sum of two rational numbers is always a rational number. If a/b and c/d are any two rational numbers, then (a/b + c/d) is also a rational number. Commutative property of addition of rational numbers: Two rational numbers can be added in any order.

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47