NaOH solution are needed to prepare 0.715 L solution of NaOH with a concentration of 0.550 M?

Answer 1

Question isn't exactly clear, but...since you probably meant to ask

How many milliliters of a 10.6 M NaOH solution are needed to prepare 0.715 L solution of NaOH with a concentration of 0.550 M? Then, the solution is as follows:

(x ml)(10.6 M) = (0.715 L x 1000 ml/L)(0.550 M)

(x ml)(10.6 M) = 715 ml)(0.550 M)

x = 37.1 mls (to 3 significant figures)