Let <em>f(x)</em> be the sum of the geometric series,

for |<em>x</em>| < 1. Then taking the derivative gives the desired sum,

Answer:
C. ±square root of 30
Step-by-step explanation:
Apply the square root function to both sides of the equation:

_____
The absolute value equation has two solutions. They match choice C.
Answer:
If we assume that everyone in the group is an owner, we would have
legs.
legs
Therefore, we need 24 more legs.
These 24 additional legs can be made from the difference of legs between the owners and dogs.
In this case, dogs have
more legs than an owner.
24 ÷ 2 = 12.
There are 12 dogs in the group.
Bone dry, sorry nothing I can do about that
D means common difference which is the last term minus second last term .
and u can use this formula only if there is a common difference.