Family eat at a restaurant the bill is $40 the family leave a tip and spends $49.77 how much was the tip in dollars? How much was the tip as a percentage of the bill?

He concluded that a heavier object dropped from the same height as a lighter object will land

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?

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons