SOMEONE HELP ME PLS In a certain country, income tax T (in dollars) is assessed according to the following function of income x:
T(x) =

0 if 0 ≤ x ≤ 10,000
0.05x if 10,000 < x ≤ 20,000
1000 + 0.18x if 20,000 < x
Find T(5,000), T(12,000), and T(25,000).
T(5,000) = $
T(12,000) = $
T(25,000) = $

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The change in water level of a lake is modeled by a polynomial function, w(x). described how to find the x-intercepts of w(x) and how to construct a rough graph of w(x) so that the parks department can predict when there will be no chage in the water level. you may create a sample polynomial of degree 3 or higher to use in your explanations.