Find the sum of the first 20 terms of the arithmetic sequence whose gen form is an=23+7n

Answers

Réponse publiée par: cbohol56
Hello !!
Find the first term.
An = 23 + 7n
A1 = 23 + 7(1)
A1 = 23 + 7
A1 = 30
Find the 20th term.
An = 23 + 7n
A20 = 23 + 7(20)
A20 = 23 + 140
A20 = 193
Find the sum of the first 18 terms of the sequence.
Sn = (n/2) × (A1 + An)
S20 = (20/2) × (30 + 193)
S20 = 10 × 223
S20 = 2230
Final result : the sum of the first 20 terms is 2230.
I hope I have collaborated !
Réponse publiée par: meteor13
1 965 is the 20th place in arithmetic
Step-by-step explanation:
an = a1 + (n-1) d
a20 = 122 + (20-1) 97
a20 = 122 + (19) 97
a20 = 122 + 1 843
a20 = 1 965
*Basta ganito yung formula ikaw na bahala mag mag-compute ng total. :)
Réponse publiée par: cbohol56
1290
Step-by-step explanation:
Given:
n = 20
A1 = 3
An = 83
Formula:
$s_{n} = \frac{n}{2} ( a_{1} + a_{n})$
Substitute and calculate.
$s_{n} = \frac{20}{2} (3 + 83) \\ s_{n} = 10(86) \\ s _{n} = 1290$
The answer is 860.
Réponse publiée par: nelspas422
19nt
Step-by-step explanation:
Réponse publiée par: nelspas422
answer:
C.200
anong subject yan
Réponse publiée par: reyquicoy4321
B. 1100
Step-by-step explanation:
the answer is 1100 kbyeee.
Réponse publiée par: calmaaprilgrace
B.780
Step-by-step explanation:
n=20,a1= -24,an=102
Sn=n/2(a1+a2)
S20=20/2(-24+102)
S20=10(78)
S20=780
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Réponse publiée par: elaineeee
It's just a substitution:

SOLUTION:

a1 = 23 + 7(1)

a1 = 30

Arithmetic Sequence: 30, 37, 44, 51, 58, 65, 72, 79, 86, 93, 100, 107, 114, 121, 128, 135, 142, 149, 156, 163.

FORMULA: Sn = n(a1 + an) / 2

S20 = 20 (30 + 163) / 2

= 10 (193)

= 1, 930

ANSWER: The sum of the first 20 terms is 1, 930.
Réponse publiée par: dorothy13
The answer is letter B. - 730
FIRST TERM a1= - 122;
NUMBER OF TERMS n=20;
COMMON DIFFERENCE d=9
Sn= n/2 [2a1 + (n-1) d]
S20= 20/2 [2(-122) + (20-1) 9]
S20= 10 [-244 + 171]
S20= 10 (-73)
S20= - 730
Réponse publiée par: hannahleigh
The sum of the first 20 terms of the arithmetic sequence is 780.
Step-by-step explanation:
Given: , ,
Formula: $S_n=\frac{n}{2}(a_n+a_1)$
Substitute the given in the formula to find the sum of the first 20 terms
$S_{20}=\frac{20}{2}(-24+102)\\S_{20}=10(78)\\S_{20}=780$
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Find the sum of the first 20 terms of the arithmetic sequence whose gen form is an=23+7n...

Find the sum of the first 20 terms of the arithmetic sequence whose gen form is an=23+7n

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Find the sum of the first 20 terms of the arithmetic sequence whose gen form is an=23+7n​

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Find the sum of the first 20 terms of the arithmetic sequence whose gen form is an=23+7n