20% because 10% of 40 is 4 so 4+4=8 then that is 10%+10% so 20% will be your answer. :)
I think it would be A.
hopefully this helped ᵔᴥᵔ
if it did dont forget to mark brainliest
Answer:
See explanation
Step-by-step explanation:

Answer:
The sides are 5,18,16
Step-by-step explanation:
To find the perimeter of a triangle, we add up all the sides
n +4n-2 + 5n-9 = 39
Combine like terms
10n -11 = 39
Add 11 to each side
10n-11+11 = 39+11
10n = 50
Divide by 10
10n/10 =50/10
n = 5
Now we need to find each side
n = 5
4n-2 = 4(5)-2 = 20-2 =18
5n-9 = 5(5) - =25-9 = 16
The sides are 5,18,16
Answer:
3n(7n^3-5n+5n)
21n^3 -15n +15n
21n^4
Step-by-step explanation:
3n(7n^3-5n+5n)
21n^3 -15n +15n
21n^4