The anserws is 88 so your welcome
The wrong step is step 4, because you only need one conversion.
The formula to convers pounds to kilograms is

Obviously, the inverse formula is

So, you're given an input of 142 pounds. To convert it in kilograms, plug that value into out formula:

and this is the answer you're looking for, so you need no more steps.
Answer:
B
Step-by-step explanation:
Sinx=opposite/hypotenuse
SinE=DF/EF
cosx =adjacent/hypotenuse
CosF=DF/EF
Hope this helps. It may not be 100% correct but just double check with a parent or with a teacher