To make this equation true we need parentheses
15 + 3 ÷ 3 = 6
a) nowhere
b) around 3 ÷ 3
c) around 15 + 3
d) around 15 + 3 ÷ 3

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