Explain your answer please I'm having trouble with these problems

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Give all possible names for the line shown.calculation tip: lines can be written with either point first.

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?