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.)

Aplane flies around trip to philadelphia it flies to philadelphia at 220 miles per hour and back home with a tailwind at 280 miles per hour if the total trip takes 6.5 hours how many miles does the plane fly round trip

Cameron indoor stadium at duke university is one of the most revered sites in all of college basketball, as well as in all of sports period. duke’s men’s and women’s basketball programs have attained quite a few wins in the building over the last seventy years. cameron indoor stadium is capable of seating 9,460 people. for each game, the amount of money that the duke blue devils’ athletic program brings in as revenue is a function of the number of people in attendance. if each ticket costs $45.50, find the domain and range of this function.

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?