What is the value of (5ý + 3) + 5?​

Let r = 3. what is the value of r + 58?

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.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?