The sum of the first n terms of an arithmetic series is 2n(n+3). Find the first term of the series using the formula n/2(2a+(n-1)d)

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.

Ill mark the brainliest if you me with the these three questions 7,8,9

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?