3. ian walks 2 km to his best friend’s house, then walks 0.5 km to the library. he then makes a 2.5 km walk home. the entire walk took him 3 hours. what is his average speed in km/h? show how you got your

Correct answer is km/h

Solution:-

Given that Lan walks 2km to his best friend's house, then walks 0.5km to the library and then he walks 2.5km alone.

So total distance walked by Lan is 2+0.5+2.5 = 5km

And to cover five km, he took three hours.

Average speed means "ratio of total distance covered to time elapsed to cover that distance."

Average speed =

                          =

Hence Lan's average speed is

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

step-by-step explanation: yes