What is .000 000 079 in scientific method

The system of equations graphed below has how many solutions?

In what form is the following linear equation written y=9x+2

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