Chapter 3.7, Problem 28E

In Exercises 15-42, translate each argument into symbolic form. Then determine whether the argument is valid or invalid. You may use a truth table or, if applicable, compare the argument’s symbolic form to a standard valid or invalid form. (You can ignore differences in past, present, and future tense.)

If I am at the beach, then I swim in the ocean.

$\frac{\text{If}\text{I}\text{swim}\text{in}\text{the}\text{ocean,}\text{then}\text{I}\text{feel}\text{refresged}\text{.}}{\therefore \text{If}\text{I}\text{am}\text{at}\text{the}\text{beach,}\text{then}\text{I}\text{feel}\text{refresged}\text{.}}$