What is the slope of a line parallel to the line y=5x+4?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

Write the expression 7x^3-28xy^2 as the product of 3 factors

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?