Which quadratic rule represents the data in the table?
x –1 0 1 2 3
y -4 -5 -4 -1 4

a. y = –2x^2 + 5
b. y = –x^2 + 5
c. y = x^2 – 5
d. y = x^2 + 5
me i literally been doing this problem for 30 minutes, i think its d but my math doesn't go with it..

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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?

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac