Anton defines an acute angle as an angle that is not obtuse. is antons definition valid?

No

Step-by-step explanation:

Acute angles are angles that measure less than 90 degrees. Obtuse angles are angles that measure more than 90 degrees. However, there are other types of angles. Take a right angle for example. It measures exactly 90 degrees, therefore it is neither obtuse or acute. So, Anton's definition cannot be valid - there are still other angles that are not obtuse that don't qualify as acute, either.

explanation:

remove parenthesis:

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apply rule

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multiply fractions:

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divide:

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mordancy.

first the equation needs to be simplified. so the equation would now look like:   52-24+11

then you multiply.

and when you multiply, you will get the answer of 39.