5) Vertices: (-7, 4), (-13, 4)
Distance from Center to Focus = 5

Computation based on the chart presented.
soil a 3.1 5.2 4.6 3.8 6 4.3 3.7 4 3.5 3.5   =41.7/10=4.17 (average growth)
soil b 2.9 3.8 5 4.8 4.5 3.9 3.9 4.4 5.5 4.1 =42.8/10=  4.28 average growth)
the highest mean is soil b compared to soil a. this means that soil b has a better type of soil for growing plants compared to soil a.