Please help answer the question

Which statement about perfect cubes is true

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.

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?