The tide at a seaport is at its maximum at 3AM. high tide is 24 feet deep. low tide occurs at 9AM with a depth of 4 feet. the water depts can be modeled by sinusoidal function. Allow x equals 0 to represent midnight. find period, amplitude, maximum, equation of the midline and minimum ​

Find dy/dx using implicit differentiation ln(20+e^xy)=y

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?

Vanessa earns a base salary of $400.00 every week with an additional5% commission on everything she sells. vanessa sold $1650.00 worth of items last week.