Three sentence in Spanish for tener and change the verb

Find the domain of the function [tex]f(x) = \sqrt{3x - 7} [/tex] in interval form

Choose the best spanish equivalent to the phrase. eat it! (the apple) ¡cómala! ¡cómela! ¡la come! ¡cómesla!

Does anyone know what my spanish teacher means by this? i need to use plural forms of the verb ser. and she asked me to use a couple of adjectives to describe the boys collectively and then the girls collectively?