What is the common difference between succeseive terms in this sequence? 9 , 2.5 , -4 , -10.5 , -17

What is the volume of the sphere shown below with a radius of 3?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3