Question

3. The sum of first n terms of an arithmetic sequence is n2

+2n.

a) What is the first term.

b) Find common difference
c) What is the sum of first 20 terms of this sequence?​

Answer 1

Answer:

i2i2b2ib22

bwlbwlw

Step-by-step explanation:

hwiwbiwbwkjwownowh2i