Evaluate the variable expression when -= 6, b= 5, and c= -3

Find the x coordinate of the point.

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?

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?