Whats the total surface area of a rectangle that has a width of 6 height of 4 and length of 4

Segment ab is shown on the graph. which shows how to find the x-coordinate of the point that will divide ab into a 2: 3 ratio using the formula

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?