Please help me, I’m begging you

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

Which function has the domain x> -11

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?