The explicit formula for the geometric sequence -1/9, 1/3, -1, 3, -9, is -1/9(-3)^x-1 . what is the common ratio and recursive formula for this sequence

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

The total number of dental clinics total for the last 12 months was recorded

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.