13. Solve the following equation and simplify, if possible: 7/8 + 5/12

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?

Use the given information to determine the exact trigonometric value.

What are the solutions of the following system? y=-2x^2 y=x-2