Mirella4mg Mirella4mg

01-08-2016
Mathematics

contestada

The third term of an arithmetic sequence is 21, and the eighth term is 56. The first term is

Respuesta :

dalendrk dalendrk

01-08-2016

[tex]a_3=21;\ a_8=56\\\\a_8-a_3=5d\\\\5d=56-21\\5d=35\ \ \ |divide\ both\ sides\ by\ 5\\d=7\\\\a_1=a_3-2d\\\\a_1=21-2\cdot7\\a_1=21-14\\a_1=7\\\\Answer:\boxed{a_1=7}[/tex]

Answer Link

Otras preguntas

People who believed in a strong central government in the period immediately prior to the Civil War, would have MOST likely joined which political party?

PLEASE HELP ME ASAP 20 POINTS SHOW WORK

What factors prompted European exploration?

what percent of driving decisions are based on information gathered with the eyes?

Newton's law stating that for every action force there is an equal and opposite reaction force; often referred to as Newton's third law of motion

As a tour guide, what do you say to calm down your passengers when the coach breaks down?

hey guys morning or night whatever part of the world u are from..but morning I am from Nigeria.Have a blessed day or peaceful night.

1. Gwen is a very _______ woman. A. determination B. determined C. determine D. determinedly

write equvalent fraction for 2/3 and 3/5 using 15 as the common denomintor

I NEED HELP ASAP WHAT IS X