Idon’t understand how to set up ratios

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 volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8