Brooklinn and Demetrius took a total of 115 photos at the science museum. Demetrius took 4 times more photos than Broolinn. How many photos did Demetrius take?

92

Step-by-step explanation:

Brooklinn and Demetrius took a total of 115 photos total, and if Demetrius took 4x as much we will know that Brooklinn will have the same amount of photos as Demetrius if he only took 1x as much.

So we will do 115 / 5 = 23 then

23 x 4 = 92

92 + 23 = 115

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