On robertos shelf are: 6 mystery books 5 science books 4 history books 3 adventure books reberto will rondomly choose 1 book to read what is the probability that he will choose an adventure book?

Solve the inequality and graph 6j - 7 < 5

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?

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form