Evaluate: 12+(-16)+24-18

What is the y-intercept of the graph of the equation y=3(2^x)

What is the solution to the equation in the & show work i’m very

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?