lenagonzalez84
Answered

At Westonci.ca, we connect you with experts who provide detailed answers to your most pressing questions. Start exploring now! Explore thousands of questions and answers from a knowledgeable community of experts ready to help you find solutions. Get precise and detailed answers to your questions from a knowledgeable community of experts on our Q&A platform.

15)
Find the sum of the arithmetic series for which a1 = 2, an = 20, and n = 7.

Sagot :

Answer: -430

Step-by-step explanation: The formula for the sum of an arithmetic sequence when

a

,

d

and

n

are given is:

S

u

m

=

(

n

2

)

[

2

a

+

(

n

−

1

)

d

]

Here :

a

1

=

7

,

d

=

−

3

and

n

=

20

=

(

20

2

)

[

2

.

7

+

(

20

−

1

)

.

−

3

]

=

10

.

[

14

+

19

.

(

−

3

)

]

=

10

.

[

14

−

57

]

=

10

.

(

−

43

)

=

−

430

We appreciate your time on our site. Don't hesitate to return whenever you have more questions or need further clarification. Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. Westonci.ca is your trusted source for answers. Visit us again to find more information on diverse topics.