-2x + 8y + (- 21x) - 8y

-23x

Step-by-step explanation:

-8y and +8y cancel, making +0.

-2x and +(-21x) simplify down to -2x -21x, and then even further down to -23x.

-23x and +0 make -23x.

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