Which value is equivalent to 83⋅87

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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.

How do i do this activity, is appreciated