One column of numbers consists of 28, 42, and 14. when the digits of the
numbers are added together, the result is 2+8+ 4+2*1* 4.21, and when
the digits of 21 are then added together, the end result is 2*1*3. if the
same process is performed on the numbers in a second column, what can be
concluded?

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

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?