Question

please answer this question ​

Answer 1

Answer:

Hope you like this answer....................

Answer 2

Step-by-step explanation:

155=29/2[2×2+(29-1)d]

155=29/2[4+28d]

155=29/2×4+28d

155=29×4+14d

155=116+14d

155-116=14d

39/14=d

2.78=d