Directions: complete each ratio table.

6
9 45 72 108
2
3 18 27 48
5
7 63 49 91
8
12 48 108 60
6
10 8 48 32 96
15 45 150 105
8
16 96 128 64
7
9 36 72 99
3
4 32 80 20

Nell has a sales clerk job that pays $12 per hour for regular gas work hours. she gets double time for any hours over 40 that she works in a week. how many hours did nell work if her weekly pay was $744

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.

Events a and b are independent. the probability of a occurring is 2/5. the probability of b occurring is 1/4. what is p(a and b)?