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YOUR ANSWER: 16 != 4 + 12 is a true statement.
We have been discussing the signs > and <, which mean, respectively, is greater than and is less than, and the != symbol, which means is not equal to.
The sign that means is neither greater nor less than is the equals sign, because if one quantity is neither greater nor less than another quantity, the two quantities must be equal. Now, 16 and 4+12 are in fact equal, so the sign that should be used is the equals sign.
The statement you choose "Sixteen is not equal to four plus twelve," is not mathematically true. Sixteen is equal to four plus twelve, so your answer was wrong.
Now return to page 15 and choose a better answer.