Suppose a matrix has columns that span ℝ. Select the best statement. A. Then the equation =0 can have nontrivial solutions, but the shape of the matrix will not give us that information. B. Then the equation =0 will have nontrivial solutions only if one column is a multiple of another column. C. Then the equation =0 must have nontrivial solution

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?