I really need help with this question

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.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.