Question

if the sum of first 9 terms of an A.P
is 72 and the common difference is 5, find
the first term and the 10th term of the AP​

Answer 1

HOPE IT WILL HELP YOU. SOLUTION IS IN THE PICTURE.

Answer 2

Answer:

Step-by-step explanation:

Let the first term be a

9th term = a+8d

S₉ (Sum to nine terms) = 9/2(a+a+8*5)

72 = 9/2(2a+40)

2a + 40 = 16

2a = -24

a = -12

First term = -12

Tenth term = -12+9*5 = 33.