[(30 + 6) − 3^2] ÷ 9 ⋅ 2

Which system of linear inequalities is graphed? can somebody pleasssse

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.

What is the value of x when x + 7 = 21?