If the first 4 terms of a geometric sequence are left curly bracket 5 comma space 20 comma space 80 comma space 320 right curly bracket, then the formula for the n to the power of t h end exponent term in the sequence is .

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.