Plss help me i need a good grade

What is the value of x in the diagram below?

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.

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7