Problem # 72 Gage is training for a mini
marathon (13 miles). He wants
to run on Mondays,
Wednesdays, and Saturdays.
The first day (a Monday) he will
run 1 mile. If he adds a half mile
to his run each time that he
runs, in how many weeks will he
be trained to run 13 miles?

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

the answer is b i just did that

step-by-step explanation:

6/20

step-by-step explanation: