4y+3y=21 simplify as much as possible

y=3

Step-by-step explanation:

Add the y and divide

7y=21

21/7=3

y=3

(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

by definition, an arc subtended by a central angle of some given measure has the same measure. so .