A number decreased by 0.8391 gives 0.1609.What is the number? a.1.0
b.0.1
c.10
d.0.10

A. 1.0

Step-by-step explanation:

1.0-0.8391= .1609

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950