3 years ago

(7+5)-2=(5+7)-2 What property is this??

Mathematics

2 answers:

Inga [223]3 years ago

8 0

It is the commutative property of addition because the 5 and 7 move places in the parentheses

SSSSS [86.1K]3 years ago

5 0

Pretty sure the distributive property my friend

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20 points!<br> I need help (asap!!)

EastWind [94]

Answer:

Step-by-step explanation:

We know that the medians of the triangle divides in a ratio of 2:1. Therefore we have the equation:

$\dfrac{9x-9}{2x+8}=\dfrac{2}{1}$ <em>cross multiply</em>

$1(9x-9)=2(2x+8)$ <em>use distributive property a(b + c) = ab + ac</em>

$9x-9=(2)(2x)+(2)(8)$

$9x-9=4x+16$ <em>add 9 to both sides</em>

$9x=4x+25$ <em>subtract 4x from both sides</em>

$5x=25$ <em>divide both sides by 5</em>

$\boxed{x=5}$

$OB=9x-9\to OB=9(5)-9=45-9=\boxed{36}$

$OE=OB:2\to OE=36:2=18\to BE=BO+OE\to BE=36+18=54$

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