Did I do this question right ? If not explain why I tried and but not sure .....
2 answers:
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Ok, here we go.
The x-value is given(Great!), so now we need to find y-value for slope
The average slope, according to the calculator, is 0.627
The x-value is given(Great!), so now we need to find y-value for slope
The average slope, according to the calculator, is 0.627
Answer:
sum(2^(n+1), for n=1 to 6)
Step-by-step explanation:
To answer this question, you need to know two things:
- what is an expression for the n-th term
- how many terms are there
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The series shown is a geometric series with first term 4 and common ratio 8/4 = 2. The generic form of the n-th term is ...
an = a1×r^(n-1) . . . . first term a1, common ratio r
You can use this form directly in your summation expression, or you can simplify it a bit.
an = 4×2^(n-1) = (2^2)(2^(n-1)) = 2^(n-1+2)
an = 2^(n+1)
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The value 128 is 2^7, so n+1 = 7, or n=6 for that term
Your summation expression could be ...
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<em>Additional comment</em>
The n-th term can also be written as 2×2^n.