Tylerpinkston Tylerpinkston

18-10-2016
Mathematics

contestada

what is the sum of the last four terms of the series 7+9+11+...21

Respuesta :

18-10-2016

For sake of convenience, reverse the series, then it would be:

21,19,17.....7

a=21, d = -2,

s(4) = 4/2 (21+15)

s(4)=2(36)

s(4) = 72

Answer Link

Otras preguntas

The Treaty of Versailles forced Germany to: keep Alsace-Lorraine, occupy Poland, accept Wilson's Fourteen Points, reduce its army and navy, keep the old German

When an author introduces the reader to an idea and then repeats it throughout the story, he is using the literary element of __. a. irony. b. motif. c. them

Raconte un événement que tu as vecu a l'ecole et qui t a particulièrement marqué

All organisms make their proteins from: the same twenty sugar molecules the same twenty amino acids different molecules, depending on the organism none of these

Percy buys tomatoes that cost $0.58 per pound. He pays $2.03 for the tomatoes, How many pounds of tomatoes does he buy?

Ivy’s father wanted to keep track of the gas he purchased for 3 weeks. He purchased 22.5 gallons during the first week and 19.71 gallons the second week. He for

What's the slope intercept for of (4,3) and (4,-4

Which of the following factors can negatively affect development? a. Political corruption and instability b. Lack of resources c. Lack of education d. All o

To reverse the balance of trade with China, British merchants sold ________ to Chinese smugglers. A.) tea B.) silver C.) silk D.) opium

which of these is a living prokaryotic cell? A: virus B:bacteria C:amoeba D:parameclum