What is the slope of a line that is perpendicular to the line y = 1?

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

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?

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?