Determine the area under the standard normal curve that lies to the left of (a) z= -1.11 (b) z= -1.06 (c) z= -1.13, and (d) z= -1.49

Venus is about 108 kilometers from the sun. saturn is about 109 kilometers from the sun. about how many times farther from the sun is saturn than venus?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?