Given:
ML = 2.3
Angle L = 70 degrees
What we want to find:
MN = x
Use the sine rule
Make sure your calculator is in degree mode
sin(angle) = opposite/hypotenuse
sin(70) = x/2.3
2.3*sin(70) = x
x = 2.3*sin(70)
x = 2.16129302780759
x = 2.2
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Answer: 2.2