Plz will give brainliest, medal, and 10 points
of the four expressions presented here, which two are equivalent?

expression i: 19n
expression ii: 4n + 9 + n + 5n
expression iii: 10n + 9
expression iv: 9n + 9

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

This stem-and-leaf plot represents the heights of the students on ralph's basketball team. one student's height is missing from the plot. if the mean height of all the students on the team is 61 inches, what is the missing height? a. 55 in. b. 59 in. c. 61 in. d. 65 in.