Kyy122
Kyy122 Kyy122
  • 14-05-2021
  • Mathematics
contestada

Find the a26 arithmetic sequence: -15,-35,-55,-75
-515
460
-490

Respuesta :

Аноним Аноним
  • 14-05-2021

Step-by-step explanation:

QUESTION:-

Find 26th term of the A.P --15,-35,-55,-75...

Solution:-

First term=a=-15

Common Difference=d=-20

We know that

[tex]\boxed{\sf a_n=a+(n-1)d}[/tex]

[tex]\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+(26-1)(-20)[/tex]

[tex]\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+25(-20)[/tex]

[tex]\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15+(-500)[/tex]

[tex]\\ \:\:\:\:\sf {:}\dashrightarrow a_{26}=-15-500[/tex]

[tex]\\ \:\:\:\:\sf {:}\dashrightarrow {\boxed{\bf a_{26}=-515}}[/tex]

Answer Link

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