You could distribute this expression to get and even MORE simplified expression. Add the two terms in the parentheses together so that you get 4(7x). Now you can simply multiply 4 by 7x which would equal 28x. The new expression is 28x.
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The answer is A, since 8 and 6 go together while you're trying to find the height for x.
Take 408/4 because there are 4 faces so that equals 102 m2
Kinetic Energy (KE) is equal to half of an object's mass (1/2*m), multiplied by the velocity squared.
This would be represented by the equation:
Ek = 1/2*mv^2
