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.)

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

cant open file sorry!

step-by-step explanation: