Light shrimp scampi*

1 pound linguine 3 tablespoons unsalted butter 3 tablespoons extra virgin olive oil 6 cloves minced garlic 1 teaspoon red pepper flakes 1 teaspoon garlic powder 1 pound large shrimp, peeled and deveined with tails on zest of 1 lemon juice of 2 lemons 1/3 cup chopped parsley 1/2 lemon cut in thin rounds In…