Answer:

Step-by-step explanation:
<u>Step 1: Round to the nearest tenth
</u>
314.1<u>5</u>93
Since the hundredths place is above 5, round up the tenth place.
314.1<u>5</u>93
314.2
Answer: 
Sometimes it will, and sometimes it won't.
I reason as follows:
(21 + x) + (30 + 2x) = 51 + 3x has an 'x' term
(42 + x) + (30 - x) = 72 has no 'x' term.
Answer:
Not confident in this answer but $9.30 ¯\_(ツ)_/¯
Step-by-step explanation:
I think the best option is 24.