The answer is three because three squared equals 27 and volume is measured length times width times height.
Answer
1 + 5 ÷ 5
This would equal 2, using BIDMAS.
Can you add the options?
Also since the options aren't there I'll just help set up.
So angle 1 and angle 3 add up to 90 degrees. Angle 1 and Angle 2 are equal so whatever option has something around those lines is correct.
a. The series is
(first four terms are listed)
b. The series converges because this is a geometric series with 
.
c. Let 
be the 
-th partial sum of the series:
Multiplying both sides by 
gives
Subtracting this from gives
As gets larger and larger 
the rational term converges to 0 and we're left with
I THINK rotational symmetry
I am really sorry if I am wrong
But I hope this helps
