Answer the questions 57,48 and 49 they are worth a lot of points.

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?