john had a stock of 1200 books in his bookshop he sold 75 on monday 50 on tuesday 64 on wednesday 78 on thursday an 135 on friday how many books were not sold write it as a fraction of total books

What is (28 + 7 + 6 + 3) x 1/2 show your work

Ian is in training for a national hot dog eating contest on the 4th of july. on his first day of training, he eats 4 hot dogs. each day, he plans to eat 110% of the number of hot dogs he ate the previous day. write an explicit formula that could be used to find the number of hot dogs ian will eat on any particular day.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.