At a restaurant, your food bill was $80$80, and you left a tip of $16$16. what percentage of the food bill did you leave for the tip?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Nine people are going to share a 128-ounces bottle of soda. how many ounces will each person get drink? choose the correct equation and answer for this situation

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.