How to find the vertex of the, quadratic equation m^2-5m-14=0

How do you answer this question? (step by step)

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

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c