Find the SS and mean of 12, 11,10,9,8 7,6,5 and 8,7,6,5,4,3,2,1​

Which of the following circles have their centers in the third quadrant? check all that apply.

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)