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Travka [436]
3 years ago
10

Find the sum of the first 30 terms of the equation below: an=4n+1

Mathematics
2 answers:
Katen [24]3 years ago
8 0

Answer:

1,890 is the sum of the first 30 terms of the equation .

Step-by-step explanation:

a_n=4n+1

if , n = 1

a_1=4\times 1+1=5

If, n = 2

a_2=4\times 2+1=9

If, n = 3

a_3=4\times 3+1=13

The arithmetic sequence comes out to be:

5, 9, 13........

a = 5

d = a_2=a_1=9-5=4

The sum of first 30 terms is given by:

S_n=\frac{n}{2}\times (2a+(n-1)d)

S_{30}=\frac{30}{2}\times (2\times 5+(30-1)\times 4)

S_{30}=1,890

1,890 is the sum of the first 30 terms of the equation .

Alex73 [517]3 years ago
6 0
Let n = 30

We are actually looking for a_30.

a_30 = 4(30) + 1

a_30 = 120 + 1

a_30 = 121

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