Question

Please answer this 16q

Answer 1

a = 121

d = -4

Let, nth term be first negative term.

so , nth term < 0

121 + (n-1)-4 < 0

 121 + 4 - 4n < 0

 125 - 4n < 0

  125 < 4n

  31.25 < n

We know that, first natural no. greater than 31.25 is 32

So, 32th term will be first negative term.

Answer 2

Answer:

write all the formulas from mensuration class 7th