Find mean, median , mode, range, mid-range 50,20,40,20,60,20,100,50

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry