Please help!! Swimming pool initially has 5 parts per million of chlorine and 12% dissipates each day. If no chlorine is added, write the Explicit Expression for a sequence that gives the chlorine concentration at the beginning of each day.

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.