Who is NoblePenguin? He deleted all my answers to questions that were correct and weren't even bad. And don't even think about deleting this you NoblePenguin!!!

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle