Answer:20.16
Step-by-step explanation:
The mnemonic SOH CAH TOA helps you remember that
... Sin = Opposite/Hypotenuse
The side opposite angle K is marked with length 5. The hypotenuse KM is marked with length 10. Using the above relationship ...
... sin(∠K) = 5/10 = 1/2
The first choice is appropriate: 
The multiplicative inverse of 6 1/8 (49/8) is
8/49
Everything separated by a '+' or '-' sign separates a term so in this expression there are 2 terms
Area = bh
Area = 4 * 7
Area = 28m2