What is the correct setup for finding the cost of renting a boat when you must pay $15 down and $7.50 for each half-hour? (hint: use c for cost and t for time.)

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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?

Which expression is equivalent to 3^3 + 2^2?