C²+5c-24=0 cant figure out how to solve this

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.

Anyone know? is appreciated! will mark brainliest if correct!

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section