2: Vlad has 15 tokens for the Huntsville Halloween Faire. Milkshakes cost 2 tokens and tickets to the Haunted House cost 2 tokens. His value for milkshakes is $2 times the square root of the number of milkshakes. His value for tickets is $7 - ($3 / number of tickets). How many milkshakes and tickets should Vlad purchase? A. 1 shake and 5 tickets B. 1 shake and 7 tickets C. 4 shakes and 1 ticket D. 4 shakes and 2 tickets E. 9 shakes and 1 ticket