Maths : Where do ( -3 , 2) and ( 0 , 2) lie in a Cartesian plane? plz gimme a correct answer

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which element is the least metallic between cadmium, silver, zinc, or iron?

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?