alan30
alan30
02-09-2017
Mathematics
contestada
how to find the sum of 2+4+6....+40?
Respuesta :
KhaiLi
KhaiLi
02-09-2017
Answer 420.
a, is the first term. d is difference.
Since this is an arithmetic progression, I use this formula.
Un = nth term
Sn = sum of terms.
First find the number of terms, which is 20.
Then use the second formula to find the sum.
Answer Link
VER TODAS LAS RESPUESTAS ( 15+ )
Otras preguntas
In 1832, Samuel Worcester sued the state of Georgia claiming the state __________.
Why did the Mormons face troubles with their neighbors in Independence, Missouri?
Why did President Franklin D. Roosevelt pay southern farmers to plant less cotton during the early 1930s? A) He wanted to increase importing of cotton from Mexi
Each one of the following words ends in est. Which one is spelled correctly? A. Sillyest B. Bigest C. Sweettest D. Flattest
America's policy toward communism was known as: A. SALT B. Mutually assured destruction C. Detente D. Containment
why did Hitler feel justified in taking over Austria and the Sudetenland?
The nuclear family is the only form of families found in North America today.
Which "spheres" are interacting when water evaporates from plants
What describes the government of the Old Kingdom in which pharaohs assumed the divine power of a god and the authority of a king? world history
Which of the following could be both a natural and a human cause of succession? a. lava flow b. overcutting c. fire d. wind
