If you dilute 11.6 mL of a 3.5 M solution to make 214.8 mL of solution, what is the molarity of the dilute solution?

3.5M x (11.6 mL/214.8 mL) = ?

or use the dilution formula of
c1v1 = c2v2
3.5 x 11.6 = c2 x 214.8