The elevation of city a is 80 feet below sea level; the elevation of city c is 16 feet below sea level . the elevation of city d is 1/2 of the elevation of city c.
part a: write an expression to represent the elevation of, in feet, of city d.
part b: solve the expression and explain why the answer is positive or negative.
pls explain it do not just give me one answer.

Pleasse me i need an answer. give me the correct answer. answer if you know it ! the club will base its decision about whether to increase the budget for the indoor rock climbing facility on the analysis of its usage. the decision to increase the budget will depend on whether members are using the indoor facility at least two times a week. use the best measure of center for both data sets to determine whether the club should increase the budget. assume there are four weeks in a month. if you think the data is inconclusive, explain why.