Please help with 11-13!

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|

Can random samples and proportional reasoning be used to determine precise information about a population? explain

Hello i need with my math homework i don't understand can someone explain how this works