The fraction bars represent which equation?

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Answer question above and explain each step : )

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.