The answer would be C, oxygen because there was not a sufficient amount.
Answer:
$9
Explanation:
First, we need to find 70% of the original price of $30 using the following equation:

It means that Emma pays $21 less than the original price. So, she pays:
$30 - $21 = $9
Therefore, the answer is $9
Answer:

Step-by-step explanation:

<em>hope</em><em> </em><em>this</em><em> </em><em>helps</em>
Answer:
It must travel through a medium
Step-by-step explanation: Because I said so >:(