Avariable of two populations has a mean of 30.7 and a standard deviation of 32.1 for one of the population and it mean if 30.7 and it’s dinner deviation of 26.6 for the other population for independent samples of size 6211 and 4581 respectively find the mean and standard deviation of x1 minus x2

Which expression is equivalent to? assume x > 0 and y > 0.

Rectangle pqrs has length a and width 4b. the x-axis bisects ps and qr what are the coordinates of the vertices

In one day there are too high tides into low tides and equally spaced intervals the high tide is observed to be 6 feet above the average sea level after six hours passed a low tide occurs at 6 feet below the average sea level in this task you will model this occurrence using a trigonometric function by using x as a measurement of time assume the first high tide occurs at x=0. a. what are the independent and dependent variables? b. determine these key features of the function that models the tide: 1.amplitude 2.period 3.frequency 4.midline 5.vertical shift 6.phase shift c. create a trigonometric function that models the ocean tide for a period of 12 hours. d.what is the height of the tide after 93 hours?