Susan spent an afternoon baking chocolate chip cookies. She gave 1/5 of the cookies to her neighbor, 1/3 to her sewing club, and 1/4 to her son's school for a bake sale. What percentage of cookies did she keep for her self?

21.66%

Step-by-step explanation:

After adding all of these fractions together:

To find the fraction of how many cookies are left subtract 47/60 from 60/60

To find the decimal point of this fraction, divide the numerator by the denominator, this will equal:

To  find the percentage, move the decimal point to the right two places

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:

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