Ineed with trigonometry. these are about angles if you could anser one or both thats greatly appreciated

In trapezoid bath, ah=19.7 and et=16.1. identify be.

Solve the system of equations. y= 2x y= x^2 - 15

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?