Answer:
8, 6.
x=8 y=6
Step-by-step explanation:
-3 + 11 = +8
-5 + 11 = +6
Answer:
50
Step-by-step explanation:
140- 40=100
100÷2=50
x=50
The wording of this question is a bit confusing... You can't write a sequence in sigma notation, but rather a series or sum. I think the question is asking you to write the sum of the sequence,

which would be

in sigma notation.
To do this, notice that the denominator in each term is a power of 2, starting with
and ending with
. So in sigma notation, this series is
