Question

pls answer ii) with step by step explanation​

Answer 1

Answer:

S5 = 250, a1 = 10, d=?

Sn = n/2 (a + l)

S5 = 5/2 (10+l)

250 = 5/2 (10+l)

250×2 = 5 (10+l)

500 = 5 (10+l)

500/5 = 10+l

100 =10+l

100-10 =l

90 = l

a5 = 90

a+4d = 90

10 + 4×d = 90

10 + 4d = 90

4d = 90-10

4d = 80

d = 80/4

d = 20