Aball is thrown from an initial height of 1 meter with an initial upward velocity of 15 m/s. the ball's height h (in meters) after seconds is given by the following.
h= 1+15t-5t^2
find all values of t for which the ball's height is 9 meters.
round your answer(s) to the nearest hundredth.
(if there is more than one answer, use the "or" button.)

t = __ seconds

What is the number 321,000,000 in scientific notation? also what is the number? ?

John checked his watch and said that it is thursday, 7 am. what will the day and time be 2006 hours plzzz i will give you 100 points

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?