In a scatterplot how do you tell if there's a correlation between production cost and gross income

Antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

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.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?