A high school's student council wants to purchase spirit shirts for its upcoming homecoming event. Purchases of 25 shirts or less cost $20 per shirt, plus $20 shipping and handling. When more than 25 shirts are ordered the price is $15 per shirt, plus S15 shipping and handling. If $720 was spent on shirts, how many shirts did the
student council order?
A. 48
B. 47
C. 37
D. 36

These question are hard can you me with answers

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?

Put the equation in slope intercept form by solving for y