Question

Determine the ap whose fourth term is 18 and the difference of the 9th term from the 15th term is 30

Answer 1

a+3d=18 and a+14d-a-8d=30

6d=30 therefore d =5

now a+3x5=18

a+15=18

a=18-15= 3

AP is 3, 8,13, .....

Answer 2

Answer:

Step-by-step explanation:

Please see the attachment below.

Hope it helps.