C3 Functions help

I'm just really confused with this.

Which part? What's confusing??

so how would you find the range to start with? Would you just do F(0) and F(360)?

so how would you find the range to start with? Would you just do F(0) and F(360)?

Not really necessary. You can just use transformations from a normal sin(x) graph to work this one out. b stretches the graph in the y-direcion and a translates it. Take the range of the normal sin(x) graph and apply the same transformations really.

you just look at the extremes of F(x) with the variable
the max value of sinx is 1 and the min is -1, so you just consider both of those cases

Ok so it will be b+c and b-c, how about the show the graph crosses the x axis if -c<b<c

Try drawing the graph, take some initiative

Ok so it will be b+c and b-c, how about the show the graph crosses the x axis if -c<b<c