isabellagstclai isabellagstclai

02-05-2017
Mathematics

contestada

please help! this is for algebra 2. im not sure that im doing it correctly. thank you!

please help this is for algebra 2 im not sure that im doing it correctly thank you class=

Respuesta :

Аноним Аноним

02-05-2017

a) an = a1 + (n-1)d

so Sn = (n/2)[ a1 + ( a1 + (n-1)d)]
= (n/2) [ 2a1 + (n-1)d ]
= na1 + n(n-1)
-------- d
2

Answer Link

Otras preguntas

What is the most common cancer for men aged 20 to 35?

Eliza's hands shook as she placed them in her lap, a tear traveling down her cheek. "I can't believe it. It's like a nightmare," she said softly, pressing her

Read this excerpt from "A Modest Proposal" by Jonathan Swift: Infant's flesh will be in season throughout the year, but more plentiful in March, and a little be

which of these is the best description of a normal supply curve?

PLEASE REALLY NEED HELP Identify the class of the italicized pronoun(s) in the sentence. {Whom} do we credit for discovering Mars?

The process of removal of the body’s wastes is called _____. a. excretion b. gas exchange c. filtration d. respiration

find the solution of the system of equations. -7x-6y=59 -8x-6y=58

Which greek selection mentions the byzantine empire?

The walls of the alimentary canal share a common pattern from esophagus to anus. how many layers make up the wall?

Match the Progressive Era amendment with the type of issue it addressed. 1. Sixteenth political 2. Seventeenth moral 3. Eighteenth social 4. Nineteenth econo