find dy/dx and d2y/dx2. x = et, y = te−t dy dx = d2y dx2 = for which values of t is the curve concave upward? (enter your answer using interval notation.)

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

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?

What is the domain of the of the exponential function shown below?