Tara started reading at 8: 50 a. m. and stopped reading at 11: 05 a. m. how long did tara read?

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 many solutions does the nonlinear system of equations graphed below have?

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?