Which number sentence does the model represent?

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.

Which expression and diagram represent “renee biked four times as far this month as last month”?

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9