Answer:
The 20 model is cheaper.
Step-by-step explanation:
There would be 0.72 cents for each tire if you bought 16. If you buy 20, you pay 0.67 cents. Therefore the 20 pach is cheaper.
Minimum = 827
Q1 = 886
Median = 995.5
Q3 = 1095.5
Maximum = 1229
The solution is x=-3, y=1, z=-1