What did you observe when you placed the halves of the cut outs beside the mirror

What is the multiplicative rate of change of the exponential function shown on the graph?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

Math i have no idea how to do a and b