En cuando excede 8/11 a 3/5

I’m not sure about that

1. use commutative property to reorder the terms.2x+81=0.2. move the constant to right side by adding its opposite on both sides. 2x+81-81=0-81.2x=(-81).3. divide the equation on both sides.2x ÷ 2 = 81 ÷ 2.x = -81/2. your answer is -81/2. if you need to simplify it into a decimal, it’s -40.5.

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

de+df> ef (option 54 is false); de+ef> df (option 1 is true); ef+df> de.

substitute sides lengths:

4+9> ef ⇒ ef< 13; 4+ef> 9 ⇒ ef> 5.

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5

a: 18°

step-by-step explanation: