Verified answer

1:

n = int(input())

steps = 0

while (n <= 800):

   n *= 3

   steps += 1

print(n, steps)

2:

x, y = map(int, input().split())

sum = 0

for i in range(x, y + 1, 4):

   sum += i

print(sum)

3:

l = []

for i in range(-5, 4):

   l.append((i, 2*i**2+7*i+0.5))

for i in l:

   print(i)