Please help me with these questions

1. How many terms are in the sequence a) 8, 12, 18, ..., 40.5? b) -2, 6, -18, ..., 4374 2. In a geometric sequence, the third term is -50 and the sixth term is 6250. Determine the sequence. 3. Find the sum of the series 16 + 10 + 4 +...+ -50. 4. Find the sum of the series 1200 + 120 + 12 + ... + 0.0012 5. Determine the type of sequence and find an expression for the general term, to, and then use to determine the indicated term. -19, -19/2, -19/4,... energies-11-0352....png Humphrey-and-Br....png 1581655448.png3. Find the sum of the series 16 + 10 + 4 +...+ -50. 4. Find the sum of the series 1200 + 120 + 12 + ... + 0.0012 5. Determine the type of sequence and find an expression for the general term, to, and then use it to determine the indicated term. -19, -19/2, -19/4,... Find ts7 g energies-11-0352....png Humphrey-and-Br...png 1581655448.png A O 196. For the series, 3.5 + 3.7 + 3.9 +... a) Find S19 b) 6.3 is also in the series. Which term is it? 7. How many terms are in the series -6 - 18 - 54 -..., if the sum is -726? 8. A person's annual salary ranges from $25 325 in the 15 year to $34 445 in the 7" year. The salaries in this range form an arithmetic sequence. a) Determine the raise the person can expect each year. b) What is the total amount the person will earn in the 7 years? ng energies- 11-0352....png Humphrey-and-Br...png 1581655448.png