Find x so the distance between (x, 2) and (2, 4) is the square root of 13. how do you work this?

The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable

For each proportion find the unknown number x 1/5/8=×/15

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.