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

Which sentence uses hyphens correctly? I ordered two sugar-coated-pies. The pie was sugar-coated. I ordered two sugar-coated pies. The ordered pie was sugar-coa

Which sentence is correctly punctuated? A. Sharon Day, the violinist played beautifully tonight. B. Sharon Day the violinist played beautifully tonight. C. Shar

meteorologists notice a low-pressure area developing over warm ocean water. which type of storm is likely to form?

What can you do if your nose has been stuffed up for 5 months?

Which verb agrees with its subject? Many passengers who ride on the bus __________ to music through headphones. A. listening B. listen C. was listening D. liste

Why are embryonic stem cells more useful than other stem cells?

I need to do my Dear Doug letter for Bible... need help ASAP! 1. Do you think Darwin's theory of evolution explains how life began? 2. But does this explain how

Need help! Why might Brazil have so strongly stressed the growing of coffee in the early 20th century? Brazilian citizens drank more coffee than any other count

round 8.373 to the nearest hundredth

Which air masses would have cold, moist air? A. continental tropical B. maritime polar C. maritime tropical D. continental polar