Question

Find the 8th term from the last of the A.P :3,7,11,15.............175,179

Answer 1

ANSWER

__________________________

AP=3,7,11,15,.........175,179

we need the 8th term from the last

By reversing the AP

New AP=179,175,..........15,11,7,3

a=179

d=-4

we need the 8th term now

a8=a+7d

=179+7(-4)

=179+(-28)

=179-28

=151

Hope it helps you ✌

__________________________

Answer 2

Answer:

151

Step-by-step explanation:

AP = 3, 7, 11 ........ 175, 179

To find the terms from the last, reverse the AP:

AP = 179, 175, ...... 11, 7, 3

Find the first term and the difference:

First Term, a1 = 179

Difference = 175 - 179 = 4

Find the nth term:

an = a1 + (n - 1)d

an = 179 + (n - 1)(4)

an = 179 + 4n - 4

an = 183 - 4n

Find the 8th term:

an = 183 - 4n

a8 = 183 - 4(8)

a8 = 151

Answer: The 8th term from the last is 151.