PLS! PLS! PLS! PLS! HELP ME! ASAP (Science: Measuring Volumes and Mass. I had to pick a subject as math because ppl are answering most question in that subject)

I would really appreciate it, I'll make u a Brainlist, thank you, give you all stars for all I care! just pls, help me. I've been trying this over and over all day and I'm about to give up. If ANYONE has the answer PLS tell Thank u very much! ToT