Please help me I need help

Select all the expressions that will include a remainder.

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.

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?