Hi my name is jasmin i've been having trouble with math. i'm learning how to multiply fractions, i want to know how to get the correct answer for this ran 5/7 of the distance around a track, sarah ran 4/5 of jasons distance. what fraction of the distance around the track did sarah run?

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?

Can someone explain to me how to do

If np3 /nc2 = 6, find the value of n