Find the common ratio geometric sequence

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?