Question

the 4th term from the end of an AP -11,-8,-5.....,49 is​

Answer 1

Hey

Here is your Answer:

From The end of an AP the 4th Term will be -

a = 49

d = -3

aₙ = -11

aₙ = a+(n-1)d

-11 = 49 + (n-1)(-3)

-11 = 49 -3n+3

-11 = 52 -3n

-11 -52 = -3n

-63= -3n

63 = 3n

63/3 = n

21 = n

a₄= 49 + (4-1)(-3)

a₄ = 49 - 9

a₄ = 40

Answer 2

Answer:

-17

Step-by-step explanation:

from last a=49

d=-3

n=?

a4=?

we know that

an=a+(n-1)d

-11=49+(n-1)-3

-11=49-3n+9

-11=58-3n

-69=-3n

n=23

now 4th term will be

an=a+(n-1)d

a4=49+(23-1)-3

a4=49+22×(-3)

a4=49+(-66)

a4=-17