Thea has a key on her calculator marked x. if an integer is displayed, pressing thex key chops off the first digit and moves it to the end. for example, if $6138$ is on the screen, then pressing the x key changes the display to $1386$. thea enters a positive integer into her calculator, then squares it, then presses the x key, then squares the result, then presses the key again. after all these steps, the calculator displays $243$. what number did thea originally enter?

me

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b

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a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

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the correct answer is 1: 2

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