6. In 2020, summer camp registration was $15 more than it was in 2021. In 2020, registration was $285. By what percentage did the summer camp registration decrease in 2021?

The graph of f(x) is obtained by reflecting the graph of f(x)=-3|x| over the x-axis. which equation describes f(x)? a) f(x)=3|x| b) f(x)=|x+3| c) f(x)=-3|x| d) f(x) = - |x+3|