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6.856 + 7.923 + 8.135 = 22.914
22.914/3 = 7.638 <=== Mean score
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15.4 seconds = 0.00428 hours and 100 meters = 0.062 miles soo the student ran approximately 14.5 mph
The prime factor of the 576 is
and the prime factor of the 64 is
. And the expression
is equal to 3.
<h3>What is simplification?</h3>
Simplification is to make something easier to do or understand and to make something less complicated.
Given
The expression is 
The prime factor of the 576 will be

The prime factor of the 64 will be

Then the expression will be

More about the simplification link is given below.
brainly.com/question/12616840