Find the sum of the first eight terms of the geometric series 1 + 2 + 4 + ... A.225
B.255
C.289
D.305

What numbers are included in the set of integers? what numbers are not included?

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)

How is this equation completed? i cannot find any examples in the book.