After reading 80\%80%80, percent of her e-mails in her inbox, Danette still has MMM unread e-mails.

Answer:The required expression is [tex]x= \frac{M}{(1 - 0.8)}[/tex] or [tex]x=5M[/tex]Step-by-step explanation:Consider provided information.After reading 80% of her emails in her inbox, Danette still has M unread emailsNow we need to determine the expression, that could represents the number of emails Danette had in her inbox before started reading.Let x be the number of emails before reading.She reads 80% of x80% can be written as 0.08.Therefore, [tex]0.80x[/tex] is the number of mails she read.Thus, the unread e-mails are[tex]x - 0.8x = M[/tex]Now we factor out x[tex]x(1 - 0.8) = M[/tex][tex]x=\frac{M}{(1 - 0.8)}[/tex][tex]x=\frac{M}{0.2}[/tex][tex]x=5M[/tex]Hence, the required expression is [tex]x= \frac{M}{(1 - 0.8)}[/tex] or [tex]x=5M[/tex]