Please help.

What is the value of x?

9.01 (I suppose you could say '9')

Step-by-step explanation:

Use pythagoras theorem. I will label the length CD as y, and I will use ✔ as square root.

First triangle.

a² + b² = c²

4² + 3² = y²

16 + 9 = y²

25 = y²

✔25 = y

y = 5

Second triangle (x)

5² + 7.5² = x²

25 + 56.25 = x²

81.25 = x²

✔81.25 = x

x = 9.01388

Disclaimer: I apologize if this is incorrect. I hope it helped!

the circle one

(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