The parabola described by y = x2 - 4x - 21 has x-intercepts at (-3,0) and (7,0). What is the vertex of this parabola?
(4, -21)
(2,-21)
(-4,9)
(2, 25)
(1,-24)
(2,-25)
(0,-24)

Which function has the domain x> -11

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

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?