An expression is defined as a set of numbers, variables, and mathematical operations. The correct expression is B.
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.
The expression that is equivalent to (f·g)(2) is,
f(x) = 7x²-3
g(x) = 5x
(g·f)(x) = g(f(x)) = 5(7x²-3)
= 5(7·2² - 3)
Hence, the correct expression is B.
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