Question

please answer it
and be brainliest...

Answer 1

Hy☺️

Answer:

16 rows and the top row has 5

Step-by-step explanation:

First row = a1 = 20 logs

Common difference = a2 - a1 = 19 - 20 = -1

Find the nth term:

an = a1 + (n - 1)d

an = 20 + (n - 1)(-1)

an = 20 - n + 1

an = 21 - n

Find nth:

Sn = 200

Sn = n/2 (a1 + an)

200 = n/2 (20 + 21 - n)

400 = n(41 - n)

400 = 41n - n²

n² - 41n + 400 = 0

(n - 16)(n - 25) = 0

n = 16 or n = 25

When n = 16

a16 = 21 - 16

a16 = 5

when n = 25

an = 21 - 25 = -4 (rejected, an cannot be negative)

Answer: There are 16 rows and the top row has 5

Hope it helps ☺️☺️

Answer 2

Answer:

there are 16 rows and on the top are 5 rows.....

hope it helps ✔✔