Answer:
Step-by-step explanation:
surface area=4πr²=36π
r²=9
r=3
Answer:
53.9
Step-by-step explanation:
:)
First you need to distribute the 9.
So 9 times 3 and 9 times 2
The Algebraic should look like now: (27^3x-18)
So the final answer is: 
You cannot simplify it anymore because there are <u>no like terms left.</u>
The square of a binomial is a pattern you would do well to remember.
.. (x +y)^2 = x^2 +2xy +y^2
Your expression has x^2 = 25a^2, so x = 5a. It also has y^2 = (b^2)/4, so y = b/2.
then the middle term is
.. 2xy = 2(5a)(b/2) = 5ab
The trinomial is
.. 25a^2 +5ab +(1/4)b^2 = (5a +b/2)^2
Covert the problem into and equation using formulas
