Respuesta :
Answer:
[tex]u-\frac{9}{10}[/tex]
Step-by-step explanation:
"The quotient of 9 and 10" would be expressed as [tex]\frac{9}{10}[/tex], or 0.9.
"u decreased by" would be expressed as "u - ".
"u decreased by the quotient of 9 and 10" would be "u-9/10"
