The runs test uses a series of 0’s and 1’s. The 0’s and 1’s represent whether each observation is:

a. is above or below the mean value of the previous two observations
b. above or below the predicted value of Y
c. above or below the mean value of Y
d. is positive or negative

fdvs

step-by-step explanation: vsfdvsfvd

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,