To determine the appropriate landing speed of an airplane, the formula d = .1x 2 − 3x + 22 is used, where x is the initial landing speed in feet per second and d is the distance needed in feet. if the landing speed is too fast, the pilot may run out of runway; if the speed is too slow, the plane may stall. what is the appropriate landing speed if the runway is 800 feet long? show all of your work or explain how you came up with your solution

2 is the final ! : )

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.