Jim walks 2 miles in an hour. It takes him 3 hrs to walk 6 miles.
a. How far would you expect him to walk in 5 hours?
How long would you expect him to take to walk 4 miles?

He would walk 10 miles in 5 hours, and it would take him 2 hours to walk 4 miles.

Step-by-step explanation:

in 5 hours he would walk 10 miles. It would take him about 2 hours to walk 4 miles

Step-by-step explanation:

Since he walks 2 miles an hour, you can multiply 5 by 2 in order to get 10 miles. Use this same strategy for the 4 miles except reverse, divide 4 by 2, 2 hours.  

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

entering that problem on the tube might get you an answer