Evaluate the expression when a=−15 and b=−5

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

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?