What does the mode represent in a set of numbers?

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?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.