If two events are complementary , then the sum of their probabilities is

a) 0.
b) 0.25.
c) 0.5.
d) 1.

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=0

True or false? a triangle can be circumscribed about a given circle

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?