this is my arithmetic series word problems homework, please explain these word problems 8,9,10

8. It's About Time, in Langley, British Columbia, is Canada's largest custom clock manufacturer. They have a grandfather clock that, on the hours, chimes the number of times that corresponds to the time of day. For example, at 4:00 p.m., it chimes 4 times. How many times does the clock chime in a 24-h period? 9. A training program requires a pilot to fly circuits of an airfield. Each day, the pilot flies three more circuits than the previous day. On the fifth day, the pilot flew 14 circuits. How many circuits did the pilot fly a) on the first day? b) in total by the end of the fifth day? c) in total by the end of the nth day? 10. The second and fifth terms of an arithmetic series are 40 and 121, respectively. Determine the sum of the first 25 terms of the series. 11. The sum of the first five terms of an arithmetic series is 85. The sum of the first is 123 What are the first four