Solve the system of equations. Use the space provided to show your work. Make sure you assign your variables to the problems given. Obtain the solution by any
method you choose. You must show the check.
A used book store also started selling used CDs and videos. In the first week, the store sold a
combination of 40 CDs and videos. They charged $4 per CD and $6 per video and the total
sales were $180. Determine the total number of CDs and videos sold.

The school track has eight lanes. each lane is 1.25 meters wide. the arc at each end of the track is 180. the distance of the home straight and the radii for the arcs in the 1st 4 lanes are given. s=85m r1=36.5m r2=37.75m r3=39m r4=40.25m part one: find the radii of lanes 5 through 8 of the track. show your work. part two: if max ran around lane one, how far did he run? show your work and explain your solution. part three: max wants to run a total of three laps around the track, choose two additional lanes (2-8) for him to run and find the distance around those two lanes. show your work and round to the hundredths. part 4: based on your lane choices in part three, what was the total distance max ran in the three laps around the track?