The row-echelon form of the augmented matrix of a system of equations is given. Find the solution of the system. 1 0 -5 -3
0 1 -4 -5
0 0 0 0
a. X = 5t+ 3
C.
x=51-3
y = 47-5
y = 47-5
Z=
t = any real number
b. x = -5t + 3
y = 48-5
Z=
t = any real number
z = 1
t = any real number
d. X=-57-3
y = 41-5
2=
* = any real number

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?