To figure out how many people are in Concord right now, we need to use the percentage change, which is a decrease of 9%.

By looking at the second column, the expression for the current estimated population of Concord can be written as p.

If we check the third column, we can say that the expression for the current estimated population in terms of p is p minus 0.09 times p, which simplifies to 0.91 times p.

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To determine the current population of Concord, we can use the percentage decrease of 9%. The current estimated population is denoted by "p". By referring to the third column, we find that the expression for the current estimated population in terms of "p" is 0.91 times "p".