Can you please assist me with the problems shown in the attached screenshot?

Figure 15 Look at the pattern and then predict the general term, or nth term, an, of the Which of the following is the general term of the sequence? sequence. O A. an = - 1"(5n) - 5, 10, - 15, 20, ... O B. an = (-1)" . 5n O c. an = (- 1) . 5 O D. an = (- 1)"(5)0 Figure 16 Find the general term of a sequence whose first four terms agree with the given terms. 4 16 64 3' 9 27 The general term is an =] (Use integers or fractions for any numbers in the expression.) Figure 17 Find the indicated sum. 6 8k K = 1 10 8k = 0 K =1 (Simplify your answer.)