Scores on a national english test are normally distributed, with a mean score of 510 and a standard deviation of 75. sixty eight percent of english tests were less than which score, rounded to the nearest whole number? 475
529
545
561

Write the sentence as an equation. z plus 372 is equal to 160

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

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?