12x=7y-10yis this a linear equation? what is it in standard form?

Which equation requires the division property of equality to be solved?

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 radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie