Kaylee is standing in a stadium and has the option of running up a staircase or down a staircase for exercise. The function f(x)=\frac{1}{50}\big(\left|6x\righ t|+4x\big)f(x)= 50 1 (∣6x∣+4x) will determine how many calories Kaylee will burn if she runs up xx steps. Use a negative value for xx if she runs down the stairs. Find and interpret the given function values and determine an appropriate domain for the function.