Give two examples that show how using parentheses can change the order in which operations are performed in an expression

Yes, parentheses can change the order in which operations are performed in an expression.

Let us understand this with two examples.

First example.

Let us suppose we have to simplify the expression

In this expression we have evaluated subtraction first instead of multiply.

Second example.

Let us suppose we have to simplify the expression

In this expression we have evaluated multiplication first and then subtraction.

Therefore, from above two examples we can see that  parentheses can change the order in which operations are performed in an expression.

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