anikkuuhh anikkuuhh

18-09-2018
Mathematics

contestada

Find the sum of the first 21 terms of the sequence 5, 9, 13, 17, 21, ... a. 945 c. 947 b. 944 d. 946

Respuesta :

18-09-2018

See how the arithmetic sequence is made:
5, 5+4=9, 9+4=13, 13+4=17, ...
So the 21th term will be:
5( first term)+20( n-1 term)•4= 85
And the sum of the first 21 is :
21(5+85)/2= 21•45= 945

Answer Link

jjolk97 jjolk97

25-05-2020

Answer:A 945 is correct

Step-by-step explanation:

Answer Link

Otras preguntas

Determine the number of moles NH41+ in 3 moles of (NH4)3PO4.

QF Q2.) Solve the triangle

What psychological effect does a daughter have without a father spending enough time with?

What is is the equation of the line perpendicular to y = 3x-7 that contains the point (6,8)?A. 1/3x - 7B. 1/3x + 6C. -1/3x - 7D. -1/3x + 10

What is a reaction with a positive enthaply spontaneous

List four factors that can result in an inaccurate temporal artery temperature reading

Describe why bacteria that live within the root nodules of a soy bean plant are a critical part of the nitrogen cycle please

How much light sleep should you be getting to get a good night's sleep?

During the Vietnam War, US forces used Agent Orange to a) locate Viet Cong camps. b)infiltrate Viet Cong camps. c)bomb enemy supply lines. d) kill off acres o

If you consume one 12-ounce can of regular (sugar) soda per day, the excess calories will amount to about ______ pounds per year.