Simplify the radical expression.

x^4y^9, the second option.

Step-by-step explanation:

A radical sign over an expression also means the expression is to the power of 1/2. In other words, the square root of n=n^1/2

(x^8y^18)^1/2

You divide the powers by 2

x^4y^9 is the answer

a. the are of the rectangle is 18.25

b. 18.25 times two is 36.50

rae me : d