Use the model to write a equation

What is the equation of the graph below? y=sec(x)-4

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

For each proportion find the unknown number x 1/5/8=×/15