Question

please answer this please​

Answer 1

Answer:

a3 = 15

=> a + 2d = 15

=> a = 15 - 2d ------(i)

Now,

S10 = 125

=> (10/2)(2(a) + 9(d)) = 125

=> 2a + 9d = 25

Substituting (i) into this,

2(15 - 2d) + 9d = 25

30 - 4d + 9d = 25

5d = 25 - 30 = -5

d = -1

=> a = 15 - 2(-1) = 15 + 2 = 17

a10 = a + 9d

= 17 + 9(-1) = 17 - 9

a10 = 8

Answer 2

Answer:

a10=8

d=-1

Step-by-step explanation:

Refer to attachment....