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2 years ago

Help please I need it now!

Mathematics

1 answer:

Alex_Xolod [135]2 years ago

8 0

Answer: $\sum^{7}_{n=1} (-2+9n)$

Step-by-step explanation:

This is an arithmetic series with first term 7 and common difference 9, so the general formula for the nth term of the sequence is $7+9(n-1)=7+9n-9=-2+9n$ .

The sequence has 7 terms, so the sigma notation is:

$\sum^{7}_{n=1} (-2+9n)$

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Step-by-step explanation:

We need to find the measures of the interior angles in a pentagon if the measure of each consecutive angle is in the ratio 9:6:10:8:12.

Let x be the common ratio

So, we can write:

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