Hope it can help u, but i dont known it right or wrong, if any wrong, it is very sorry for you...
Answer:
<u>"2a − 6". </u>
Step-by-step explanation:
The correct expression is "2a − 6".
This is a way to verify:
Let's say Adrianna sold 36 magazines. Now, substitute in that for a in the expression and calculate:

Now, is 66 six less than the double of 36? The answer is yes, therefore, the expression is correct.
We are youngggggg so set the world on fire
Here, You need to apply "Proportionality Theorem"
According to this theorem, the ratio of components of a leg would be equal to the ratio of corresponding components of another leg.
In mathematical form,
AB/BD = AC/CD
Substitute their values,
36/24 = x/18
2/3 = x/18
x = 18*3 / 2
x = 54 / 2
x = 27
In short, Your Answer would be 27
Hope this helps!