Answer:
21 i think ;-; b. v.
Step-by-step explanation:
hyf6ygtuygfyjbfryjjhggyujhgrt
Polygon is a plane figure that is bounded by a finite chain of straight line segments called edges or sides, that are closing in a loop to form a closed polygon chain or circuit. A triangle is the simplest polygon that has three sides and three angles. They are special because they are the only polygons with minimum number of sides. The sum of angles in a triangle is equal to 180 degrees.
bearing in mind that an absolute value expression, is in effect a piece-wise expression, so once we remove the bars, we really end up with two siblings, one is negative, the other positive, of the same expression.
![\bf |2x-3|+4=17\implies |2x-3|=13\implies \begin{cases} +(2x-3)=13\\ 2x-3=13\\ 2x=16\\[1em] x=\cfrac{16}{2}\\[1em] \boxed{x=8}\\[-0.5em] \hrulefill\\ -(2x-3)=13\\ -2x+3=13\\ -2x=10\\[1em] x=\cfrac{10}{-2}\\[1em] \boxed{x=-5} \end{cases}](https://tex.z-dn.net/?f=%5Cbf%20%7C2x-3%7C%2B4%3D17%5Cimplies%20%7C2x-3%7C%3D13%5Cimplies%20%5Cbegin%7Bcases%7D%20%2B%282x-3%29%3D13%5C%5C%202x-3%3D13%5C%5C%202x%3D16%5C%5C%5B1em%5D%20x%3D%5Ccfrac%7B16%7D%7B2%7D%5C%5C%5B1em%5D%20%5Cboxed%7Bx%3D8%7D%5C%5C%5B-0.5em%5D%20%5Chrulefill%5C%5C%20-%282x-3%29%3D13%5C%5C%20-2x%2B3%3D13%5C%5C%20-2x%3D10%5C%5C%5B1em%5D%20x%3D%5Ccfrac%7B10%7D%7B-2%7D%5C%5C%5B1em%5D%20%5Cboxed%7Bx%3D-5%7D%20%5Cend%7Bcases%7D)
Hello :
the sum is arithmetic secquence of common -diff is :
(-7)-(-5) =(-5)-(-3) = (-3)-(-1) =-2 = d
the first term is : a1 = -1
<span>the formula of the sum : S= (n/2)(a1 +an)
n is number of term an = a1+(n-1)d</span>
7 and 1/3 hope this helps