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serenity spa charges $55 for a one-hour massage. they charge $0.75 for each additional minute over an hour. if x represents the number of minutes over one hour, which of the following equations represents the cost of a massage?
a. y = -0.75x + 55
b. y = 0.75x + 55.75
c. y = 55x + 0.75
d. y = 0.75x + 55

The weight of a small starbucks coffee is a normally distributed random variable with a mean of 340 grams and a standard deviation of 11 grams. find the weight that corresponds to each event. (use excel or appendix c to calculate the z-value. round your final answers to 2 decimal places.)highest 30 percent middle 70 percent highest 90 percent lowest 20 percent