What cell generates energy for all the other cells (it’s for science but it doesn’t show science as a subject so yes)

What is the volume of this container?

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?