Solve this equation until you have the squared variable for the missing side length on one side of the equal sign and a rational number on the other.

21 squared

Step-by-step explanation:

this is because you add together 9 and 12. this gives you 21 and because you want it squared it would be 21 squared.

(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

there is no grid

step-by-step explanation: