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An equation in the variable n.
It is either 3*2 + a or 3*(2 + a)
The expression (3t \times 3t) can be simplified by multiplying the coefficients and the variable separately. First, multiply the coefficients: (3 \times 3 = 9). Then, multiply the variable (t) by itself: (t \times t = t^2). Therefore, the result is (9t^2).
The variable in 14x is x.
It is not a variable. The equation says that the energy contained in any given mass is equivalent to the mass times the velocity of light squared.