1, 7, 13, 19, ..., 6n +7 a. How many terms are there in the sequence? Your answer will be in terms of n. terms. Consider the sequence an = b. What is the second-to-last-term (in terms of n)? an-1= c. Find the sum of all the terms in the sequence, in terms of n. Sn Find -1 + 8 10 64 100 ... 825 1025 + Find and y such that 2, x, y, 16 is part of an arithmetic sequence. x = y = Then find and y so that the sequence is part of a geometric seqeuence. x = y = Reminder: x and y may not be integers. If they are not, enter your response to 3 decimal places. Find and y such that 5, x, y, 32 is part of an arithmetic sequence. x = y = Find and y such that 5, x, y, 32 is part of a geometric sequence. (Warning: and y might not be integers.) X = y