The total cost of a desk and a stool is $86.50. The stool costs $25.50 less than the desk.
How much does the stool cost?

$30

Step-by-step explanation:

d + s= 86.501

d - 25.50 = s

d - s=25.502

1 - 2

(d-d) +(s-(-s))=86.50-25.50

2s=60

s=60/2=$30

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