This is the question I meant to post:

Find the value of x, please put an explanation

Step-by-step explanation:

Ok, let's see how much I can do

So I don't know how to label the angles, but let's just say there are 2 angles at point B. One is already given. 72. Since a line is 180. We can find the other angle by subtraction: 180 - 72 = 108

And we can also tell that both angles at point D are equal as they are both represented by 2x.

Now by the looks of it, Line AC and DE are parallel so angle A and both the angles at point D are equal to each other. So triangle ABD is at least an isosceles triangle.  Now because we know it's an isosceles triangle, we can now find the measure of triangle ABD.

72 + 2x + 2x = 180

72 + 4x = 180

4x = 108

x = 27

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

47.28 or 47.2857143

step-by-step explanation:

you just divide 331 by 7 and you get that answer. ( i think so tho)