Consider a chessboard, which has a total of 64 squares. one grain of rice is placed on the 1st square, 2 grains on the 2nd square, 4 grains on the 3rd square, 8 grains on the 4th square, and so on. how many grains of rice will be placed on square number 18?

Ineed with math stuff it involves graphs

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score

1. if events a and b are non-overlapping events, how do you find the probability that one or the other occurs? 2. what does it mean if p(a or b) equals 1?