Answer: triangle sum , x= 9
Step-by-step explanation:
The triangle angle sum theorem states that the 3 interior angles of a triangle sum to 180 degrees. Add all of the angle measures together and set equal to 180. (3x-4)+(5x-7)+(13x+2) = 180. Combine like terms. 21x -9 = 180. Add 9 to both sides. 21x= 189. Divide both sides by 21. X = 9
Each time you are subtracting 1/9 to get the next term
For example, going from term 2 to term 3 is a difference of -1/9
(1 8/9) - (1/9) = 1 7/9
which is why the answer is choice A
<span>6x-7y=-84
7y = 6x + 84
y = 6/7(x) + 12</span>
Tenemos precio de lista de $25 para el libro.
Si aplicamos un descuento del 25%, este descuento representa:

Ahorramos $6.25.
El precio que pagamos el libro es $18.75.
The perimeter of the shape is 30 add all the sides