2x + 8y = 21 6x - 4y = 14

With math question will mark brainliest question in the pic.

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300

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?