IAMTHEGREATEST IAMTHEGREATEST

16-06-2017
Mathematics

contestada

What is the sum of the first 20 terms in the arithmetic series?

−6+(−2)+2+6+...

624

640

654

680

Respuesta :

steve77 steve77

17-06-2017

Use sum of arithmetic series:
Sum of n terms = (n/2)(2a + (n - 1)d)
where a is the first term, -6
d is the common diff, 6 - 2 = 4
and n is the number of terms, 20

Sum of first 20 terms
= (20/2)(2(-6) + 19(4))
= 640

Answer Link

Otras preguntas

Which would be the best source for locating the most information about the Spanish-American War?

How did the Civil Rights Act of 1964 help African Americans? A The act authorized the U.S. attorney general to send federal employees to register voters. B The

How did Harry Truman's presidency impact the civil rights of African-Americans during the late 1940's and early 1950's? A) During Truman's presidency, African-A

What is the value of r? Enter your answer, as an exact value, in the box. r = ____

Which of the following is true about plays A. Writing plays can be difficult because people spoken vocabulary is usually much larger than the written vocabulary

the processing of forming two DNA molecules from one is called? A)Replication B)transcription C)translation D)expression

Lester Frank Ward argued in his book Dynamic Sociology that government could regulate the economy, cure poverty, and promote education much more efficiently tha

Why did Chekhov and other early modernist playwrights use everyday dialogue? A. To appeal to the audience and reveal the complexity of Human Relationships B. To

can someone please help me with this ?

Simplify the expression 4(3y-2)