What is the value of the expression-2(-3+-1)

Look at this expression. a3b3c a-3b-3c-1 which of the following is the simplest form of the expression above?

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

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?