Evaluate the series 4-2 1-0.5 0.25 to s10. round to the nearest tenth.
a. 5.50
b.-2.75
c.2.75
d. 2.66

If we're talking about series, we're talking about a summation.
This is a geometric series, so we will be using the sum to n terms of a geometric series given by:

, where a is the first term, r is the common ratio, and n is the number of terms.

Now, we know the first term is 4.
We know the ratio is
And we are finding to the 10th term.

Plugging everything into the equation:


After this, we get: 2.6640625... ≈ 2.66 (ie D)