3x -7 = 5x + 19
-7 = 2x + 19
-26 = 2x
x= -13
She is not correct. All integers are rational numbers.
Using the law of indices the equivalent expression of
is 1728
<h3>How to find equivalent expression?</h3>
The equivalent expression of
can be express as follows:
Using the law of indices,

Applying this laws,

Hence,

Finally,
12³ = 1728
learn more on expression here: brainly.com/question/16619965
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the second 3 (from the left) is in the hundreds place so we look at the 1st 7 (from the left) to determine how to round
since 7 is 5 or greater, we round the 3 to a 4
3400
Choice D