1. find the sum of the measures of exterior angles, one at each vertex, of an octagon.
a. 180*
b. 360*
c. 1080*
d. 1440*

2. if the sum of the interior angles of a polygon is 900* ( * = degrees) , then how many sides does the polygon have?
a. 6
b. 7
c. 8
d. 9
10. based on the information given, can you determine that the quadrilateral must be a parallelogram? explain.
11. the parallelogram has the angle measures shown. can you conclude that it is a rhombus, rectangle, or a square? explain.

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?