Lydia rides her bike3 miles from her house to the store. then sheer bike 7 miles from the store to her friends house. then she rides her bike home. she doesn't know how far it is from het friends house to her own house but she knows that she biked 15 miles in all.how far is it from lydias friends house to her own house

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.