Question

Sn = 134, n = 10, d = 2, a1 = ?​

Answer 1

Answer:

you can use this formula to solve the problem

Step-by-step explanation:

Sn=n/2[2*a+(n-1)*d]

i think this is help you

Answer 2

Answer:

a1 = 22.4

Step-by-step explanation:

Sn = 134

n = 10

d = 3

let the first term be 'a'

.'. 134 = 10/2{2a + (10-1)×2}

=> 134 = 5(2a + 18)

=> 134 = 10a + 90

=> 44 = 10a

=> a = 4.4

we know that,

a1 = a + (n-1)d

Now,

a1 = 4.4 + 9 × 2

= 4.4 + 18

= 22.4