Answer:
30
Step-by-step explanation:
21*10=210
210/7=30
x=30
The volume for 1 a. is 79.50700. (You just multiply 4.3 by itself three times)
I don't know what the second one is though, sorry.
Answer:

Step-by-step explanation:
<u>Recall:</u>
- Sinusoidal Function ->

- Amplitude ->

- Period ->

- Phase Shift ->

- Vertical Shift/Midline ->

<u>Given:</u>
- Amplitude ->

- Period ->

- Phase Shift ->

- Vertical Shift/Midline ->

<u>Conclusion:</u>
The equation that models the situation is 
Hope this helped! I've attached a graph of the function so you can understand it better!
Answer:
-2
Step-by-step explanation: