There are 70 balls in a box: 20 red, 20 blue, 20 yellow, and 10 that are either black or white. What is the least number of balls you must take out of the box (without looking) to be sure that among them there are 10 balls of the same color?

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?

Which expression is equivalent to 3^3 + 2^2?

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