You can do C(6,2) which gives 
which is 15!
A rectangle has a length of 3x + 9 and a width of 5x - 4.
1 answer:
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Step-by-step explanation:
the answer is in the image above
<span>3x+4=y+5, then y+5=3x+4
It is called: reflexive property
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</span>
<span>x = y and y = 10, then x = 10
It is called: equality substitution property
</span>
It is called: reflexive property
-----------------------------
</span>
<span>x = y and y = 10, then x = 10
It is called: equality substitution property
</span>