Answer:
The required expression is or
Step-by-step explanation:
Consider provided information.
After reading 80% of her emails in her inbox, Danette still has M unread emails
Now 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 x
80% can be written as 0.08.
Therefore, is the number of mails she read.
Thus, the unread e-mails are
Now we factor out x
Hence, the required expression is or