Asap can someone with my math 3 and 4 plz and tell me how chu know plz and thx

3. 22.5 + 9.5 = 32

32/2 = 16

16*8 = 128 ft^2

4. 432 units^2

(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