What are the key features of function f? f(x) = log x
Function f crosses the x-axis at [(1,0), (0,0), (0,1)]. As x increases, the function [increases, decreases]. As x approaches its vertical asymptote of [x = 1, x = -1, x = 0], the function [decreases to negative infinity, increases to positive infinity].
Someone please help, I can’t find answers to any of my questions!

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?