Given f(x)= -3x² + 9x, what is the value of f(-2)

What is the value of y? round to the nearest tenth

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.

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.