Part b. is the second part of this question. If you could explain to me or answer, I'd really appreciate it. This is sort of urgent, so I'd need to get it done soon. Thank you.

Which equation can be used to measure the density of water in a spherical water tank? let w represent the number of water particles within the region.

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

Which option identifies how kevin should proceed in the following scenario? four years ago kevin designed an mp3 player for young children. now that technology has changed, he would like to update his design to ensure that it encompasses cutting-edge techniques. by creating a third-angle projection of his ideas by designing an isometric projection of his new ideas by referring to past designs and illustrations of his original model by conferring with engineers who have improved upon similar devices