In the Recreational Mathematics, we introduced some of the basic rules of the game Four 4’s. We now expand our operations to include square roots. For example, one way to represent the whole number 8 is √4 + √4 + √4 + √4 = 2 + 2 + 2 + 2 = 8.Using at least one square root of 4, √4, play Four 4’s to represent the following whole numbers:

(a) 11

(b) 13 

(c) 14 

(d) 18