The ship is 25.54 miles away from the lighthouse.
If it is the midpoint, then FG= FM+MG
Also, this means that they are of equal lenght, so
FM=MG
<span>5y + 13= 5-3y
5y+3y=5+13
8y=18
y=

=2.25
</span>
which means that the two halves are equal to 5y+13=5*2.25+13=24.25
and FG is double the lenght:
24.25*2=49
Number of proper subsets = 2^number of elements- 1
= 2^n - 1
No of elements = 4
2^4-1 = 16-1 = 15

<em>these two options apply</em>
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in decimals : 0.015625