HELP PLEASE - It's around midnight and i have an assignment due in a few hours along with a pile of others- does anyone know the answer to this? x (to the second power) =36?

i have been working on this forever and i cannot figure out what x could be-

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.