Answer:
First option
Step-by-step explanation:

Let n represent unknown number
4n^2 is the final answer. Hope it help!
The value of "z" equals 8
Write "st div. by 6r" as
st
-------
6r
45s 15s 3s
If r =5 and t = 45, but s is unknown, then we get --------- = --------- = -------
6(r) 2(5) 2
If you are talking about pi/4 radians then that would be 45 degrees because pi in radians is 180 degrees.