Which sentence uses parentheses correctly?
O 1. Algebra and geometry (both of which you'll study later, are somewhat harder than general mathematics),
2. Frost the cake with (Seven-Minute Icing recipe on page 12) and then decorate with gumdrops.
3. Certain fruits (watermelon and bananas are usually high) in the mineral potassium,
0.4. Turn right on Elm (see attached map), and go four blocks.