Agroup of hikers have to walk around a lake. they walk due north at a pace of
2.5km/hr for 1.5hours. then they head due east and walk another 45min at a pace
of 2km/hr. how much farther did they have to walk by going around the lake?

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

x = 23.78

step-by-step explanation:

i think it might be a but you might want a second opinion

hi how are you doing today? if you ever need just tell me

step-by-step explanation: