CAN SOMEONE HELP ME WITH THESE TWO? I NEED AN EXPLANATION AS WELL!! THANK YOU:))

In an experiment you are to flip a two sided coin 100 times and record 55 heads up and 45 tails up determine the theoretical and experimental probability of getting a heads up in the experiment.

Find the solutions for a triangle with a =16, c =12, and b = 63º

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?