Put in answer choice number 3 i belive this is correct
= 10a(2y-x) + 21b(2y-x)
=(2y-x)(10a+21b)
<span>The phrase 18 is means that 18 is the part. 40% means that 40 will replace percent in our proportion. The phrase of what number represents the whole and is the unknown quantity.</span>
Since, many chemistry conferences have held a 50-trillion angstrom run.
we have to convert this unit into kilometers and miles.
Let us convert it into kilometers first.
Since, 1 trillion = 
So, 50 trillion Angstorm =
Angstorm
Since, 1 Angstorm = 
So, 50 trillion Angstorm = 
= 
So, 50 trillion Angstorm = 5km
Now, we will express it into miles
Since, 1 mile = 1.61 km
So, 5 km = 
= 3.105 miles
= 3.11 miles
So, 50 trillion Angstorm = 5 km = 3.11 miles
<span>x^2-15x+56 = (x -7)(x - 8)
so
</span><span>x^2-15x+56
----------------
x-7
</span>(x -7)(x - 8)
=------------------
x-7
= x - 8
answer
<span>D.) x-8</span>