1. What is Preservation? 2.Why does refrigerator and freezing help preserve food for a longer time? ​

q.1 ans

Preservation—The protection of cultural property through activities that minimize chemical and physical deterioration and damage and that prevent loss of informational content. The primary goal of preservation is to prolong the existence of cultural property.

Explanation:

q.2 ans

Cold temperatures help food stay fresh longer. The basic idea behind refrigeration is to slow down the activity of bacteria (which all food contains) so that it takes longer for the bacteria to spoil the food. ... Refrigeration and freezing are two of the most common forms of food preservation used today.

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

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the median of the data is 4.5.