Given the equation x^2 +9y^2-90y+225=0, which of the following gives the coordinates of the center of the given ellipse?

A.(-3,5)
B.(5,-3)
C.(3,5)
D.(5,3)

Can someone me and do the problem plz so i can understand it more better

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126