#1**+2 **

3.

Area = pi * r^2 ....so we have

108.94 = pi * r^2 divide both sides by pi

108.94 / pi = r^2 take the square root of both sides

√ [ 108.94 / pi ] = r ≈ 5.89 ft

4. Note, NSS....we don't need to do much math here....logic will suffice

From a positive radical on the right, we CANNOT get a negative answer....thus....the 5x on the left side CANNOT evaluate to a negative whenever we plug in an x value.....thus, x CANNOT be negative

Notice that the first, second and fourth answers will produce at least one negative outcome for 5x

So....by a process of elimination, the second answer is the only one that is any good

Do you see that???.....sometimes....logic is BETTER than MATH !!!

CPhill Feb 1, 2018