Please answer! giving brainliest

d .

x=11

Step-by-step explanation:

ML and JK are chords of the circle

MN*LN=JN*KN

(x-7)*(x+21)=(x+5)*(x-3)

x^2+21x-7x-7*21=x^2-3x+5x-5*3

x^2+14x-147=x^2+2x-15

x^2-x^2+14x-2x=147-15

12x=132

x=132/12=11

(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

5+2x=a

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