If you ignore friction, the amount of time required for a box to slide down an inclined plane is square root of 2a/g sin theta cos theta
where a is the horizontal distance defined by the inclined plane, g is the acceleration due to gravity and

theta

is the angle of the inclined plane. For what values of

theta

is the expression undefined?

a. 0°

b. 90°

c. both a and b

d. none

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?