A jar contains 4 chocolate chip cookies and 10 raisin cookies. If you reach into the jar what is the theoretical probability that you will choose a chocolate chip cookie.

A. 2/3
B. 2/7
C. 2/5
D. 2/9

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?

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.