Question

10th term of an arthematic sequence is 20 and it's 20th term is 10

a) what is the common difference ?
b) what is the first term?
c) what is the 30th term​

Answer 1

Step-by-step explanation:

Here is your solution for the above question

Answer 2

Answer:

a)a+9d=20

a+19d=10

- - =-

10d=10

d=-10/10

d=-1

b)a+9d=20

a-9=20

a=29

c)a+29d

29-29

=0