A laser beam with an output of 6 milliwatts is directed into a series of mirrors. The laser beam loses 2% of its power every time it reflects off of a mirror. The power p(n) is an exponential function of the number of reflections in the form of p(n)=ab^n. What is the value of a?

Talia took the bus from her home to the bank and then walked back to her home along the same route. the bus traveled at an average speed of 40 km/h and she walked at an average speed of 5 km/h. to determine the time, x, that it took talia to walk home, she used the equation 40(0.9 – x) = 5x. the time of trip 2 is hours. the distance of trip 1 is km.