In the function (5e^x) / (5e^x + 7)

Where is f(x) concave up?

And where is f(x) concave down?

*use interval notation*

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

What is the difference between the equations of a vertical and a horizontal line?

Mason and christian go to the movie theater and purchase refreshments for their friends. mason spends a total of $45.75 on 3 bags of popcorn and 6 drinks. christian spends a total of $71.50 on 6 bags of popcorn and 4 drinks. write a system of equations that can be used to find the price of one bag of popcorn and the price of one drink. using these equations, determine and state the price of a drink, to the nearest cent.