What is the value represented by the digit 4 after 6,345 is multiplied by 1,000?

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Tell whether the two rates form a proportion

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute