The ? Is 3
As 4^3 = 64
4x4x4= 64
The unit rate would be:
4 dollars for 1 steak
The linear equation:
y = k x + b
We will use first two values and solve the system of equations:
11 = k * 7 + b / *(-1)
13 = k * 8 + b
---------------------
-11 = - k * 7 - b
13 = k * 8 + b
----------------------
2 = k
13 = 16 + b
b = 13 - 16 = -3
y = 2 x - 3 ( y varies directly with x )
It decreases by 0.5
The original mean was 5.5
The new mean is 5
