Whyy do my notifications stay even after i check them

How to convert a density of 0.791g/cm3 to lb/ft3

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

Acandle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. the wick is usually surrounded by wax. which is the most important property of covalent compounds that makes them useful for making candle wax? a low boiling point a low melting point a high boiling point a high melting point