Answer:
angle opposite side x= 40 degrees
angle opposite 7 cm= 30 degrees
let's denote the length of X as y
now we can setup the equation using sine rule
y/sin40= 7/sin30
to find the value of y we can solve for y
y= 7× sin40/sin30
y= 7×sin40/1/2
y=7×2×sin40
x^a14 ×0.6428
x^a8.998cm
