My grade in algebra is 82% i took a test and got a 51% what is my final grade? test grades: 50% ** don't answer if you don't know.**

66.5%

Step-by-step explanation:

50% of Homework + 50% of Tests = 100% of Algebra grade

        .5 x .82           +     .5 x .51       =

             .41              +       .255         =

                               .665                   =

                               66.5%                =   Final Grade

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

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step-by-step explanation: