C. Writer
"for the food magazine" is modifying "writer"
Hopefully that helps! If, "for the food magazine" is no the correct underlined phrase, just message back! That's just what I think is underlined! :)
X+9 ? I'm not sure if that was the kind of answer you were looking for but that's what I got out of that.
<h3>The terms 4x and 5y has different variable present in it.

</h3>
<em><u>Solution:</u></em>
Given that,

<em><u>The reason is:</u></em>
When we are adding terms which has exactly the same variables, we must add the constants and let the result stand with variable
Which means,
4x + 10x = 14x
But,
We cannot add terms that has different variable
Which means,
4x + 5y
Here, both the terms 4x and 5y has different variable present in it. Hence they cannot be added together

The answer is B because the quantity tends to stay the same as the sample goes up
Here's an explanation! :)