Which expression is represented by the diagram?

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Can someone me out here and the tell me the greatest common factor

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6