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Oksana_A [137]
2 years ago
9

Given the sequence 8, 12, 16, 20, 24, what is the sum of the 31st and 19th terms?

Mathematics
1 answer:
erica [24]2 years ago
7 0

Answer:

First term (a) =8

Common difference (d)= t2-t1

=12-8

=4

Now, sum of first 31th term (tn31) =n/2{2a+(n-1)d}

= 31/2{2×8+(31-1)4}

=31/2{16+(30×4)

=31/2(16+120)

=31/2×126

=31×63

Step-by-step explanation:

Similarly use 19 as (n) for the 19th term

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Answer:

The frequency of note E is:

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The ratio of the frequency of note E to the frequency of note C is just the quotient of these two frequencies:

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Now, we want to find how man E waves will fit in the length of four C waves.

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For waves, we have the relationship:

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N = (4*λ(C))/(λ(E) ) = (5.2 m)/(1.04m) = 5.14

So we can fit 5 E waves into four C waves.

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