Donations of $375 in March to a homeless shelter are 250% of what they were in February. What were the donations to the shelter in February?

$150

Step-by-step explanation:

March = $375 = 250% (February)

February = ?

For percentages, I like to use the rule of 3.

375 is in dollars, 250 and 100 are in percents

$150 in February

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

they used 313 gallons of paint