What is the solution to the inequality? -4/5x is greater than or equal to 1/10

-4x/5≥1/10
-8x≥1
x≤-1/8
x∈(-∞;-1/8]

A unit is a measurement. for example, a unit could be an inch, or it could be a foot. to convert you need the exact measurement so if a line is 12 inches it's 1 foot. if it is 13 then it stays in inches. You convert units to the easiest variable to calculate and then you solve your equation from there. 

Hope I helped! :)