0 has none and 9 has 9 place value i think lol
I got 2 but this could be wrong. Hope this helps ;D
If 12 types only last 4 days, and the rest last an average of 6, then the average amount of days that ALL the flowers wilt would be 5. To find the average, you add 6 and 4 to get 10, and since there is only 2 number we added togehter to get 10, you would divide 10 by 2 to get 5!
the value of r of the geometric series n=11.3(0.8)n-1

General formula for nth term of any geometric series is 
Here 'r' is the common ratio
a_1 is the first term of the series
Now we compare the given formula with general formula
Compare
with 
The value of r= 0.8
Use the property of distribution:
a(b+c) = ab + ac
4(4a+5) = 4(4a) + 4(5)
4(4a+5) = 16a + 20
Hope that helps :)