In January, a bookstore sells 450 books, but in February, it sells only 300 books. What is the percent of change from January to February? 50%
-33.3%
-50%
66.7%

Find the given elements if matrix d:

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?

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28