Question

The 7th term of a Arithmetic sequence is 40 and the 13th term is 80

a) What is the 10th term of the series?

b) Calculate the sum of the first 19 terms

c) What is the sum of the first 19 words of the Arithmetic sequence, 7th term is 42 and 13th

term is 82?​

Answer 1

Answer:

a) = 60

rest you can find out by yourself

Step-by-step explanation:

a7 = 40

a+6d = 40

and a13 = 80

a+12d = 80

12d-6d = 80-40

6d = 40

d= 40/6

and a= 0

a) a10 = a+9d

a10 = 0+ 9* 40/6 = 60