Question

please reply the friends question of answers please friend reply .

Answer 1

| -1 7 |
| 2 4 |

=> -1(4) -2(7) = -4 -14 = -18

Answer 2

(2) An = a + ( n - 1 ) d
=> 70 = 120 + ( n - 1 ) - 5
=> 70 = 120 + ( - 5n + 5 )
=> 70 = 120 - 5n + 5
=> 5n = 120 - 70 + 5
=> 5n = 55
=> n = 55/5 = 11
hence, 5th term of an A.P is 70