Y(t)=e^((t^r)/s satisfies y' − 4 t^15y = 0 if r=? and s=? I'm unsure of the steps to go through after plugging in the first derivative into the equation. How do you solve for the two different variables?

Triangle xyz has vertices x(1,3), y(0,0)

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?