6 out of 18 kids said hello to Mr. Koller this morning. What percent of kids said hello to Mr. Koller?

For what value of x does 4x = (1/8) x + 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?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?