Answer:28.5 ounces
Explanation: Divide $3.42 by the cost per ounce ($0.12). That gives you the number of ounces he purchased, or 28.5 ounces.
Answer:

Step-by-step explanation:
a - 4 < 10 <em>add 4 to both sides</em>
a - 4 + 4 < 10 + 4
a < 14

These are all approximate decimal versions of the given numbers' square roots. If you need help rounding the decimals to a certain number of digits, let me know.
I hope this helps :)