With this information can you get the answers for me?

7. Use the following data to find the equation of the line of best fit (Use the points (4,39), (12,23): Time (Sec) Depth of water (Cm) 2 43 A 39 6 32 8 30 10 26 12 23 14 18 16 14 18 11 20 5 8. Using the data and your equation above, find: a) Find the depth of water after 15 sec. b) Find the time in secs when the depth = 20 cm. c) Interpret the slope