Answer:
V= 42.41
Step-by-step explanation:

where r is the radius = 3 and h is the height = 4.5
×
× 
V = 42.41
Answer:
c. 24
Step-by-step explanation:
15+9=24
Answer:
Step-by-step explanation:
100(9801 - 8910)/8910 = 10%
i dont get it...what are the elements of each letter?
It's a value you should probably memorize:

You can derive it using some trigonometric identities, other known values of cosine, and properties of the cosine function. For example, using the double angle identity for cosine:

If
, then

and you probably know that
, so

When we take the square root, we should take the positive root because
whenever
:
